Remove WGC3D::isContextLost references from cc

cc/layers/texture_layer_client.h

Index: cc/layers/texture_layer_client.h
diff --git a/cc/layers/texture_layer_client.h b/cc/layers/texture_layer_client.h
index 187b12f16c4851a19227c3a9a082b64dbc939048..d191a5bd5ab3bf74bcd2b9eadb3b556ef266d108 100644
--- a/cc/layers/texture_layer_client.h
+++ b/cc/layers/texture_layer_client.h
@@ -19,10 +19,6 @@ class TextureLayerClient {
   // Returns the texture ID to be used for compositing.
   virtual unsigned PrepareTexture() = 0;
 
-  // Returns the context that is providing the texture. Used for rate limiting
-  // and detecting lost context.
-  virtual WebKit::WebGraphicsContext3D* Context3d() = 0;
-
   // Returns true and provides a mailbox if a new frame is available.
   // Returns false if no new data is available
   // and the old mailbox is to be reused.