Revert of Android: support multiple displays on C++ side

content/browser/renderer_host/render_widget_host_unittest.cc

Index: content/browser/renderer_host/render_widget_host_unittest.cc
diff --git a/content/browser/renderer_host/render_widget_host_unittest.cc b/content/browser/renderer_host/render_widget_host_unittest.cc
index 69a7bcf618efd46c41a916473341b90d5ef10e65..90f6077e49c717f0b6eeb905f236fe8555f66526 100644
--- a/content/browser/renderer_host/render_widget_host_unittest.cc
+++ b/content/browser/renderer_host/render_widget_host_unittest.cc
@@ -40,7 +40,6 @@
 #include "content/browser/renderer_host/context_provider_factory_impl_android.h"
 #include "content/browser/renderer_host/render_widget_host_view_android.h"
 #include "content/test/mock_gpu_channel_establish_factory.h"
-#include "ui/android/screen_android.h"
 #endif
 
 #if defined(USE_AURA) || defined(OS_MACOSX)
@@ -477,7 +476,6 @@
     ContextProviderFactoryImpl::Initialize(&gpu_channel_factory_);
     ui::ContextProviderFactory::SetInstance(
         ContextProviderFactoryImpl::GetInstance());
-    ui::SetScreenAndroid();  // calls display::Screen::SetScreenInstance().
 #endif
 #if defined(USE_AURA)
     screen_.reset(aura::TestScreen::Create(gfx::Size()));
@@ -508,7 +506,6 @@
     ImageTransportFactory::Terminate();
 #endif
 #if defined(OS_ANDROID)
-    display::Screen::SetScreenInstance(nullptr);
     ui::ContextProviderFactory::SetInstance(nullptr);
     ContextProviderFactoryImpl::Terminate();
 #endif