Remove SupportsWeakPtr inheritance from GLES2Decoder

gpu/command_buffer/service/gles2_cmd_decoder_mock.h

Index: gpu/command_buffer/service/gles2_cmd_decoder_mock.h
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_mock.h b/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
index 7ca7f8f2d234d22f2aa561f4c5e90c850482438f..b4374407e35cf7d36654cf6cc207a24da7f48fa3 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
@@ -44,6 +44,8 @@ class MockGLES2Decoder : public GLES2Decoder {
                               int num_entries,
                               int* entries_processed);
 
+  base::WeakPtr<GLES2Decoder> AsWeakPtr() override;
+
   MOCK_METHOD5(Initialize,
                bool(const scoped_refptr<gl::GLSurface>& surface,
                     const scoped_refptr<gl::GLContext>& context,
@@ -164,6 +166,9 @@ class MockGLES2Decoder : public GLES2Decoder {
   MOCK_CONST_METHOD0(WasContextLostByRobustnessExtension, bool());
   MOCK_METHOD1(MarkContextLost, void(gpu::error::ContextLostReason reason));
 
+ private:
+  base::WeakPtrFactory<MockGLES2Decoder> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(MockGLES2Decoder);
 };