Revert of Make 2D canvas disable gpu acceleration when getImageData is called

third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
index 5b5d29e843231598da863f36a4d5c0a8304b907c..fd63a8c4c28799f5b87de40cc57d89f3b1e1f93c 100644
--- a/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp
@@ -318,13 +318,6 @@
     m_dirtyRect = FloatRect();
 }
 
-void HTMLCanvasElement::didDisableAcceleration()
-{
-    // We must force a paint invalidation on the canvas even if it's
-    // content did not change because it layer was destroyed.
-    didDraw(FloatRect(0, 0, size().width(), size().height()));
-}
-
 void HTMLCanvasElement::restoreCanvasMatrixClipStack(SkCanvas* canvas) const
 {
     if (m_context)