Revert of Pass initial size and GPU preference via context attributes

content/browser/compositor/gpu_process_transport_factory.cc

Index: content/browser/compositor/gpu_process_transport_factory.cc
diff --git a/content/browser/compositor/gpu_process_transport_factory.cc b/content/browser/compositor/gpu_process_transport_factory.cc
index 142dc651dab6121daf1a012295d4a8378e59c820..805a2204090d4633185df25a17eea387d9ec1577 100644
--- a/content/browser/compositor/gpu_process_transport_factory.cc
+++ b/content/browser/compositor/gpu_process_transport_factory.cc
@@ -137,9 +137,9 @@
   GURL url("chrome://gpu/GpuProcessTransportFactory::CreateContextCommon");
   return make_scoped_refptr(new content::ContextProviderCommandBuffer(
       std::move(gpu_channel_host), gpu::GPU_STREAM_DEFAULT,
-      gpu::GpuStreamPriority::NORMAL, surface_handle, url, automatic_flushes,
-      support_locking, gpu::SharedMemoryLimits(), attributes,
-      shared_context_provider, type));
+      gpu::GpuStreamPriority::NORMAL, surface_handle, url,
+      gl::PreferIntegratedGpu, automatic_flushes, support_locking,
+      gpu::SharedMemoryLimits(), attributes, shared_context_provider, type));
 }
 
 #if defined(OS_MACOSX)