Bug 1275750 (Part 3) - Remove imgFrame::GetFormat(). r=edwin

--HG--
extra : rebase_source : 013843b9eb385723237a45843cddd443c6d20af0

image/imgFrame.cpp

@@ -667,13 +667,6 @@ imgFrame::GetRect() const
   return gfx::IntRect(mOffset, mSize);
 }
 
-SurfaceFormat
-imgFrame::GetFormat() const
-{
-  MonitorAutoLock lock(mMonitor);
-  return mFormat;
-}
-
 uint32_t
 imgFrame::GetImageBytesPerRow() const
 {

image/imgFrame.h

@@ -223,13 +223,6 @@ public:
   uint32_t* GetPaletteData() const;
   uint8_t GetPaletteDepth() const { return mPaletteDepth; }
 
-  /**
-   * Get the SurfaceFormat for this imgFrame.
-   *
-   * This should only be used for assertions.
-   */
-  SurfaceFormat GetFormat() const;
-
   AnimationData GetAnimationData() const;
 
   bool GetCompositingFailed() const;