Remove SupportsWeakPtr inheritance from GLES2Decoder

gpu/command_buffer/service/gles2_cmd_decoder_passthrough.h

Index: gpu/command_buffer/service/gles2_cmd_decoder_passthrough.h
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough.h b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough.h
index 63a62dad6b2877135a119e74a2393e5a94b2cb50..eeaa378024365de403447357a4e44a0e73dcfa25 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough.h
@@ -79,6 +79,8 @@ class GLES2DecoderPassthroughImpl : public GLES2Decoder {
 
   const char* GetCommandName(unsigned int command_id) const override;
 
+  base::WeakPtr<GLES2Decoder> AsWeakPtr() override;
+
   bool Initialize(const scoped_refptr<gl::GLSurface>& surface,
                   const scoped_refptr<gl::GLContext>& context,
                   bool offscreen,
@@ -398,6 +400,8 @@ class GLES2DecoderPassthroughImpl : public GLES2Decoder {
   // Cache of scratch memory
   std::vector<uint8_t> scratch_memory_;
 
+  base::WeakPtrFactory<GLES2DecoderPassthroughImpl> weak_ptr_factory_;
+
 // Include the prototypes of all the doer functions from a separate header to
 // keep this file clean.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doer_prototypes.h"