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

chrome/browser/chromeos/first_run/first_run_view.cc

 // Copyright 2013 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 "chrome/browser/chromeos/first_run/first_run_view.h"
 
 #include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
 #include "chrome/browser/ui/webui/chromeos/first_run/first_run_ui.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/render_view_host.h"
@@ skipping 13 matching lines @@
 void FirstRunView::Init(content::BrowserContext* context) {
   web_view_ = new views::WebView(context);
   AddChildView(web_view_);
   web_view_->LoadInitialURL(GURL(chrome::kChromeUIFirstRunURL));
 
   content::WebContents* web_contents = web_view_->web_contents();
   web_contents->SetDelegate(this);
   extensions::ChromeExtensionWebContentsObserver::CreateForWebContents(
       web_contents);
 
-  web_contents->GetRenderViewHost()->GetView()->SetBackgroundColor(
-      SK_ColorTRANSPARENT);
+  web_contents->GetRenderViewHost()->GetView()->SetBackgroundOpaque(false);
 }
 
 FirstRunActor* FirstRunView::GetActor() {
   return static_cast<FirstRunUI*>(
       web_view_->web_contents()->GetWebUI()->GetController())->get_actor();
 }
 
 void FirstRunView::Layout() {
   web_view_->SetBoundsRect(bounds());
 }
@@ skipping 16 matching lines @@
     content::WebContents* source,
     const blink::WebGestureEvent& event) {
   // Disable pinch zooming.
   return event.type == blink::WebGestureEvent::GesturePinchBegin ||
       event.type == blink::WebGestureEvent::GesturePinchUpdate ||
       event.type == blink::WebGestureEvent::GesturePinchEnd;
 }
 
 }  // namespace chromeos