[content] Fix background color update handling in RWHVAura.

content/browser/renderer_host/render_widget_host_view_mac_unittest.mm

Index: content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm b/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
index 578e7a21df7d491b06c8e13ecf9c1364aab844a3..7502ed56011a3e153eee3574832b0e5327b9531c 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac_unittest.mm
@@ -1270,11 +1270,13 @@ TEST_F(RenderWidgetHostViewMacTest, Background) {
       new MockRenderWidgetHostImpl(&delegate, process_host, routing_id);
   RenderWidgetHostViewMac* view = new RenderWidgetHostViewMac(host, false);
 
-  EXPECT_TRUE(view->GetBackgroundOpaque());
+  EXPECT_NE(static_cast<unsigned>(SK_ColorTRANSPARENT),
+            view->background_color());
   EXPECT_TRUE([view->cocoa_view() isOpaque]);
 
   view->SetBackgroundColor(SK_ColorTRANSPARENT);
-  EXPECT_FALSE(view->GetBackgroundOpaque());
+  EXPECT_EQ(static_cast<unsigned>(SK_ColorTRANSPARENT),
+            view->background_color());
   EXPECT_FALSE([view->cocoa_view() isOpaque]);
 
   const IPC::Message* set_background;
@@ -1288,7 +1290,7 @@ TEST_F(RenderWidgetHostViewMacTest, Background) {
   // Try setting it back.
   process_host->sink().ClearMessages();
   view->SetBackgroundColor(SK_ColorWHITE);
-  EXPECT_TRUE(view->GetBackgroundOpaque());
+  EXPECT_EQ(static_cast<unsigned>(SK_ColorWHITE), view->background_color());
   EXPECT_TRUE([view->cocoa_view() isOpaque]);
   set_background = process_host->sink().GetUniqueMessageMatching(
       ViewMsg_SetBackgroundOpaque::ID);