remove call to didModifyBackingTexture

Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp

Index: Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp
diff --git a/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp b/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp
index 801d904a6f18e1cac1ad6907588af534b3072a78..2097456899f8bd1bcca3b5eef88e04ddb9ca75be 100644
--- a/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp
+++ b/Source/platform/graphics/gpu/AcceleratedImageBufferSurface.cpp
@@ -62,11 +62,6 @@ AcceleratedImageBufferSurface::AcceleratedImageBufferSurface(const IntSize& size
     clear();
 }
 
-void AcceleratedImageBufferSurface::didModifyBackingTexture()
-{
-    m_surface->getCanvas()->getTopDevice()->accessBitmap(false).notifyPixelsChanged();
-}
-
 PassRefPtr<SkImage> AcceleratedImageBufferSurface::newImageSnapshot() const
 {
     return adoptRef(m_surface->newImageSnapshot());