Mojo bindings environment: remove usage in gles2.

components/bitmap_uploader/bitmap_uploader.cc

Index: components/bitmap_uploader/bitmap_uploader.cc
diff --git a/components/bitmap_uploader/bitmap_uploader.cc b/components/bitmap_uploader/bitmap_uploader.cc
index acca97b4a253d2384c919301b1f8a57832218ea8..d65474277564f8df571bf10aaec56b4ec8fb57f1 100644
--- a/components/bitmap_uploader/bitmap_uploader.cc
+++ b/components/bitmap_uploader/bitmap_uploader.cc
@@ -54,9 +54,8 @@ void BitmapUploader::Init(mojo::Connector* connector) {
   mus::mojom::CommandBufferPtr gles2_client;
   gpu_service_->CreateOffscreenGLES2Context(GetProxy(&gles2_client));
   gles2_context_ = MojoGLES2CreateContext(
-      gles2_client.PassInterface().PassHandle().release().value(),
-      nullptr,
-      &LostContext, nullptr, mojo::Environment::GetDefaultAsyncWaiter());
+      gles2_client.PassInterface().PassHandle().release().value(), nullptr,
+      &LostContext, nullptr);
   MojoGLES2MakeCurrent(gles2_context_);
 }