1 files changed, 56 insertions, 59 deletions

diff --git a/dom/html/HTMLMediaElement.cpp b/dom/html/HTMLMediaElement.cpp
index bc63eab512..cbb86edace 100644
--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -3726,77 +3726,74 @@ int32_t HTMLMediaElement::TabIndexDefault()
   return 0;
 }
 
-nsresult HTMLMediaElement::SetAttr(int32_t aNameSpaceID, nsIAtom* aName,
-                                   nsIAtom* aPrefix, const nsAString& aValue,
-                                   bool aNotify)
-{
-  nsresult rv =
-    nsGenericHTMLElement::SetAttr(aNameSpaceID, aName, aPrefix, aValue,
-                                  aNotify);
-  if (NS_FAILED(rv))
-    return rv;
-  if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::src) {
-    DoLoad();
-  }
-  if (aNotify && aNameSpaceID == kNameSpaceID_None) {
-    if (aName == nsGkAtoms::autoplay) {
-      StopSuspendingAfterFirstFrame();
-      CheckAutoplayDataReady();
-      // This attribute can affect AddRemoveSelfReference
-      AddRemoveSelfReference();
-      UpdatePreloadAction();
+nsresult
+HTMLMediaElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
+                                const nsAttrValue* aValue,
+                                const nsAttrValue* aOldValue, bool aNotify)
+{
+  if (aNameSpaceID == kNameSpaceID_None) {
+    if (aName == nsGkAtoms::src) {
+      mSrcMediaSource = nullptr;
+      if (aValue) {
+        nsString srcStr = aValue->GetStringValue();
+        nsCOMPtr<nsIURI> uri;
+        NewURIFromString(srcStr, getter_AddRefs(uri));
+        if (uri && IsMediaSourceURI(uri)) {
+          nsresult rv =
+            NS_GetSourceForMediaSourceURI(uri, getter_AddRefs(mSrcMediaSource));
+          if (NS_FAILED(rv)) {
+            nsAutoString spec;
+            GetCurrentSrc(spec);
+            const char16_t* params[] = { spec.get() };
+            ReportLoadError("MediaLoadInvalidURI", params, ArrayLength(params));
+          }
+        }
+      }
+    } else if (aName == nsGkAtoms::autoplay) {
+      if (aNotify) {
+        if (aValue) {
+          StopSuspendingAfterFirstFrame();
+          CheckAutoplayDataReady();
+        }
+        // This attribute can affect AddRemoveSelfReference
+        AddRemoveSelfReference();
+        UpdatePreloadAction();
+      }
     } else if (aName == nsGkAtoms::preload) {
       UpdatePreloadAction();
     }
   }
 
-  return rv;
+  // Since AfterMaybeChangeAttr may call DoLoad, make sure that it is called
+  // *after* any possible changes to mSrcMediaSource.
+  if (aValue) {
+    AfterMaybeChangeAttr(aNameSpaceID, aName, aNotify);
+  }
+
+  return nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName,
+                                            aValue, aOldValue, aNotify);
 }
 
-nsresult HTMLMediaElement::UnsetAttr(int32_t aNameSpaceID, nsIAtom* aAttr,
-                                     bool aNotify)
+nsresult
+HTMLMediaElement::OnAttrSetButNotChanged(int32_t aNamespaceID, nsIAtom* aName,
+                                         const nsAttrValueOrString& aValue,
+                                         bool aNotify)
 {
-  nsresult rv = nsGenericHTMLElement::UnsetAttr(aNameSpaceID, aAttr, aNotify);
-  if (NS_FAILED(rv))
-    return rv;
-  if (aNotify && aNameSpaceID == kNameSpaceID_None) {
-    if (aAttr == nsGkAtoms::autoplay) {
-      // This attribute can affect AddRemoveSelfReference
-      AddRemoveSelfReference();
-      UpdatePreloadAction();
-    } else if (aAttr == nsGkAtoms::preload) {
-      UpdatePreloadAction();
-    }
-  }
+  AfterMaybeChangeAttr(aNamespaceID, aName, aNotify);
 
-  return rv;
+  return nsGenericHTMLElement::OnAttrSetButNotChanged(aNamespaceID, aName,
+                                                      aValue, aNotify);
 }
 
-nsresult
-HTMLMediaElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
-                                const nsAttrValue* aValue, bool aNotify)
-{
-  if (aNameSpaceID == kNameSpaceID_None && aName == nsGkAtoms::src) {
-    mSrcMediaSource = nullptr;
-    if (aValue) {
-      nsString srcStr = aValue->GetStringValue();
-      nsCOMPtr<nsIURI> uri;
-      NewURIFromString(srcStr, getter_AddRefs(uri));
-      if (uri && IsMediaSourceURI(uri)) {
-        nsresult rv =
-          NS_GetSourceForMediaSourceURI(uri, getter_AddRefs(mSrcMediaSource));
-        if (NS_FAILED(rv)) {
-          nsAutoString spec;
-          GetCurrentSrc(spec);
-          const char16_t* params[] = { spec.get() };
-          ReportLoadError("MediaLoadInvalidURI", params, ArrayLength(params));
-        }
-      }
+void
+HTMLMediaElement::AfterMaybeChangeAttr(int32_t aNamespaceID, nsIAtom* aName,
+                                       bool aNotify)
+{
+  if (aNamespaceID == kNameSpaceID_None) {
+    if (aName == nsGkAtoms::src) {
+      DoLoad();
     }
   }
-
-  return nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName,
-                                            aValue, aNotify);
 }
 
 nsresult HTMLMediaElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
@@ -5634,7 +5631,7 @@ nsIContent* HTMLMediaElement::GetNextSource()
                 "Should only iterate over direct children");
 #endif
 
-    int32_t startOffset = 0;
+    uint32_t startOffset = 0;
     rv = mSourcePointer->GetStartOffset(&startOffset);
     NS_ENSURE_SUCCESS(rv, nullptr);