Revert of Pass initial size and GPU preference via context attributes

android_webview/browser/aw_render_thread_context_provider.cc

Index: android_webview/browser/aw_render_thread_context_provider.cc
diff --git a/android_webview/browser/aw_render_thread_context_provider.cc b/android_webview/browser/aw_render_thread_context_provider.cc
index 8e82beda8d49de7cfa64f0edcceb5f7e5a5807f8..c5a585aee0f0c30213711b680bb6eddf4341f9e6 100644
--- a/android_webview/browser/aw_render_thread_context_provider.cc
+++ b/android_webview/browser/aw_render_thread_context_provider.cc
@@ -62,7 +62,8 @@
 
   context_.reset(gpu::GLInProcessContext::Create(
       service, surface, surface->IsOffscreen(), gfx::kNullAcceleratedWidget,
-      nullptr /* share_context */, attributes, limits, nullptr, nullptr));
+      surface->GetSize(), nullptr /* share_context */, attributes,
+      gl::PreferDiscreteGpu, limits, nullptr, nullptr));
 
   context_->GetImplementation()->SetLostContextCallback(base::Bind(
       &AwRenderThreadContextProvider::OnLostContext, base::Unretained(this)));