Remove Mojo GLES2 API

components/mus/public/cpp/context_provider.h

Index: components/mus/public/cpp/context_provider.h
diff --git a/components/mus/public/cpp/context_provider.h b/components/mus/public/cpp/context_provider.h
index 0538efb0cae2ed34e09627de2cb0162bc097c351..78d701bf8a327e9734f5181c24e81055d68bd542 100644
--- a/components/mus/public/cpp/context_provider.h
+++ b/components/mus/public/cpp/context_provider.h
@@ -38,11 +38,6 @@ class ContextProvider : public cc::ContextProvider {
   ~ContextProvider() override;
 
  private:
-  static void ContextLostThunk(void* closure) {
-    static_cast<ContextProvider*>(closure)->ContextLost();
-  }
-  void ContextLost();
-
   mojo::ScopedMessagePipeHandle command_buffer_handle_;
   std::unique_ptr<GLES2Context> context_;