Remove Mojo GLES2 API

components/mus/public/cpp/lib/context_provider.cc

Index: components/mus/public/cpp/lib/context_provider.cc
diff --git a/components/mus/public/cpp/lib/context_provider.cc b/components/mus/public/cpp/lib/context_provider.cc
index f1468f0228808c5290466a41d90d89773a006a5c..7e06ee6dbe8080be1aaf297ebfccc42e316333ed 100644
--- a/components/mus/public/cpp/lib/context_provider.cc
+++ b/components/mus/public/cpp/lib/context_provider.cc
@@ -18,10 +18,8 @@ ContextProvider::ContextProvider(
 }
 
 bool ContextProvider::BindToCurrentThread() {
-  DCHECK(command_buffer_handle_.is_valid());
   std::unique_ptr<GLES2Context> context(new GLES2Context(
-      std::vector<int32_t>(), std::move(command_buffer_handle_),
-      &ContextLostThunk, this));
+      std::vector<int32_t>(), std::move(command_buffer_handle_)));
   if (context->Initialize())
     context_ = std::move(context);
   return !!context_;
@@ -60,6 +58,4 @@ base::Lock* ContextProvider::GetLock() {
 ContextProvider::~ContextProvider() {
 }
 
-void ContextProvider::ContextLost() {}
-
 }  // namespace mus