Cleanup of removing unnecessary web_contents.h include from webview.h. This is split off from https…

ui/views/examples/webview_example.cc

 // Copyright (c) 2012 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 "ui/views/examples/webview_example.h"
 
 #include "content/public/browser/browser_context.h"
+#include "content/public/browser/web_contents.h"
 #include "ui/views/controls/webview/webview.h"
 #include "ui/views/layout/fill_layout.h"
 
 namespace views {
 namespace examples {
 
 WebViewExample::WebViewExample(content::BrowserContext* browser_context)
     : ExampleBase("WebView"),
       webview_(NULL),
       browser_context_(browser_context) {
 }
 
 WebViewExample::~WebViewExample() {
 }
 
 void WebViewExample::CreateExampleView(View* container) {
   webview_ = new WebView(browser_context_);
   container->SetLayoutManager(new FillLayout);
   container->AddChildView(webview_);
 
   webview_->LoadInitialURL(GURL("http://www.google.com/"));
   webview_->web_contents()->Focus();
 }
 
 }  // namespace examples
 }  // namespace views