Remove old texture path in TextureLayer

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 47d6ae0e174309337b92350900d0aa6c4c061f20..0b8b2256fd873aaf25ae54b52f08a01107ae5f9b 100644
--- a/cc/layers/texture_layer_client.h
+++ b/cc/layers/texture_layer_client.h
@@ -13,10 +13,6 @@ class TextureMailbox;
 
 class TextureLayerClient {
  public:
-  // Called to prepare this layer's texture for compositing.
-  // Returns the texture ID to be used for compositing.
-  virtual unsigned PrepareTexture() = 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.