Extract minimal RenderViewHost interface for embedders, leaving

content/browser/renderer_host/render_view_host_browsertest.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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 "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/browser/renderer_host/render_view_host.h"
@@ skipping 12 matching lines @@
   RenderViewHostTest() {}
 };
 
 
 IN_PROC_BROWSER_TEST_F(RenderViewHostTest,
                        ExecuteJavascriptAndGetValue) {
   ASSERT_TRUE(test_server()->Start());
   GURL empty_url(test_server()->GetURL("files/empty.html"));
   ui_test_utils::NavigateToURL(browser(), empty_url);
 
-  RenderViewHost* rvh =
-      browser()->GetSelectedWebContents()->GetRenderViewHost();
+  RenderViewHostImpl* rvh = static_cast<RenderViewHostImpl*>(
+      browser()->GetSelectedWebContents()->GetRenderViewHost());
 
   {
     Value* value = rvh->ExecuteJavascriptAndGetValue(string16(),
                                                      ASCIIToUTF16("!false;"));
     EXPECT_EQ(Value::TYPE_BOOLEAN, value->GetType());
     bool bool_value;
     EXPECT_TRUE(value->GetAsBoolean(&bool_value));
     EXPECT_TRUE(bool_value);
   }
 
@@ skipping 174 matching lines @@
   ui_test_utils::NavigateToURL(browser(), test_url);
   EXPECT_TRUE(observer.base_url().is_empty());
   EXPECT_EQ(1, observer.navigation_count());
 
   // But should be set to the original page when reading MHTML.
   test_url = net::FilePathToFileURL(test_server()->document_root().Append(
       FILE_PATH_LITERAL("google.mht")));
   ui_test_utils::NavigateToURL(browser(), test_url);
   EXPECT_EQ("http://www.google.com/", observer.base_url().spec());
 }