Move frameBlameContext() accessor to FrameLoaderClient.

Make it clear this is only used for LocalFrames.

Review-Url: https://codereview.chromium.org/2566893003
Cr-Commit-Position: refs/heads/master@{#437919}

third_party/WebKit/Source/core/frame/FrameClient.h

@@ -35,8 +35,6 @@ class CORE_EXPORT FrameClient : public GarbageCollectedFinalized<FrameClient> {
 
   virtual void frameFocused() const = 0;
 
-  virtual BlameContext* frameBlameContext() { return nullptr; }
-
   virtual ~FrameClient() {}
 
   DEFINE_INLINE_VIRTUAL_TRACE() {}

third_party/WebKit/Source/core/loader/FrameLoaderClient.h

@@ -342,6 +342,8 @@ class CORE_EXPORT FrameLoaderClient : public FrameClient {
   // Overwrites the given URL to use an HTML5 embed if possible. An empty URL is
   // returned if the URL is not overriden.
   virtual KURL overrideFlashEmbedWithHTML(const KURL&) { return KURL(); }
+
+  virtual BlameContext* frameBlameContext() { return nullptr; }
 };
 
 }  // namespace blink