Mojo bindings environment: remove usage in gles2.

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 d2d6ce012d22298629c102e93a8f48caee4c69da..0b0b470a7c111c43ce3b3cbf8e5428726d76b448 100644
--- a/components/mus/public/cpp/lib/context_provider.cc
+++ b/components/mus/public/cpp/lib/context_provider.cc
@@ -9,7 +9,6 @@
 #include "base/logging.h"
 #include "mojo/gles2/gles2_context.h"
 #include "mojo/gpu/mojo_gles2_impl_autogen.h"
-#include "mojo/public/cpp/environment/environment.h"
 
 namespace mus {
 
@@ -25,8 +24,7 @@ ContextProvider::ContextProvider(
 bool ContextProvider::BindToCurrentThread() {
   DCHECK(command_buffer_handle_.is_valid());
   context_ = MojoGLES2CreateContext(command_buffer_handle_.release().value(),
-                                    nullptr, &ContextLostThunk, this,
-                                    mojo::Environment::GetDefaultAsyncWaiter());
+                                    nullptr, &ContextLostThunk, this);
   context_gl_.reset(new mojo::MojoGLES2Impl(context_));
   return !!context_;
 }