Revert of Sets the default background color of inline signin and user manager to grey

extensions/browser/guest_view/web_view/web_view_guest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/browser/guest_view/web_view/web_view_guest.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/browser_context.h"
@@ skipping 359 matching lines @@
 
 void WebViewGuest::GuestReady() {
   // The guest RenderView should always live in an isolated guest process.
   CHECK(web_contents()->GetRenderProcessHost()->IsIsolatedGuest());
   Send(new ExtensionMsg_SetFrameName(web_contents()->GetRoutingID(), name_));
 
   // We don't want to accidentally set the opacity of an interstitial page.
   // WebContents::GetRenderWidgetHostView will return the RWHV of an
   // interstitial page if one is showing at this time. We only want opacity
   // to apply to web pages.
-  if (guest_opaque_) {
-    web_contents()
-        ->GetRenderViewHost()
-        ->GetView()
-        ->SetBackgroundColorToDefault();
-  } else {
-    web_contents()->GetRenderViewHost()->GetView()->SetBackgroundColor(
-        SK_ColorTRANSPARENT);
-  }
+  web_contents()->GetRenderViewHost()->GetView()->
+      SetBackgroundOpaque(guest_opaque_);
   if (web_view_guest_delegate_)
     web_view_guest_delegate_->OnGuestReady();
 }
 
 void WebViewGuest::GuestSizeChangedDueToAutoSize(const gfx::Size& old_size,
                                                  const gfx::Size& new_size) {
   scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
   args->SetInteger(webview::kOldHeight, old_size.height());
   args->SetInteger(webview::kOldWidth, old_size.width());
   args->SetInteger(webview::kNewHeight, new_size.height());
@@ skipping 633 matching lines @@
 }
 
 void WebViewGuest::SetAllowTransparency(bool allow) {
   if (guest_opaque_ != allow)
     return;
 
   guest_opaque_ = !allow;
   if (!web_contents()->GetRenderViewHost()->GetView())
     return;
 
-  if (guest_opaque_) {
-    web_contents()
-        ->GetRenderViewHost()
-        ->GetView()
-        ->SetBackgroundColorToDefault();
-  } else {
-    web_contents()->GetRenderViewHost()->GetView()->SetBackgroundColor(
-        SK_ColorTRANSPARENT);
-  }
+  web_contents()->GetRenderViewHost()->GetView()->SetBackgroundOpaque(!allow);
 }
 
 bool WebViewGuest::LoadDataWithBaseURL(const std::string& data_url,
                                        const std::string& base_url,
                                        const std::string& virtual_url,
                                        std::string* error) {
   // Make GURLs from URLs.
   const GURL data_gurl = GURL(data_url);
   const GURL base_gurl = GURL(base_url);
   const GURL virtual_gurl = GURL(virtual_url);
@@ skipping 179 matching lines @@
   WebViewGuest* guest =
       WebViewGuest::From(embedder_render_process_id(), new_window_instance_id);
   if (!guest)
     return;
 
   if (!allow)
     guest->Destroy();
 }
 
 }  // namespace extensions