Revert of Pass initial size and GPU preference via context attributes

content/test/layouttest_support.cc

Index: content/test/layouttest_support.cc
diff --git a/content/test/layouttest_support.cc b/content/test/layouttest_support.cc
index cf56a43f133ba05856ccf1b10e5ef402fa5784e6..318b43552979c8f9ad5c97e7584f06166a188366 100644
--- a/content/test/layouttest_support.cc
+++ b/content/test/layouttest_support.cc
@@ -203,8 +203,8 @@
             gpu::GpuStreamPriority::NORMAL, gpu::kNullSurfaceHandle,
             GURL(
                 "chrome://gpu/LayoutTestDependenciesImpl::CreateOutputSurface"),
-            automatic_flushes, support_locking, gpu::SharedMemoryLimits(),
-            attributes, nullptr,
+            gl::PreferIntegratedGpu, automatic_flushes, support_locking,
+            gpu::SharedMemoryLimits(), attributes, nullptr,
             command_buffer_metrics::OFFSCREEN_CONTEXT_FOR_TESTING));
 
     cc::LayerTreeSettings settings =