Avoid parsing the webstore base url so much.

chrome/browser/prerender/prerender_browsertest.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 <stddef.h>
 #include <deque>
 #include <set>
 #include <string>
 #include <unordered_map>
 #include <utility>
@@ skipping 2880 matching lines @@
 }
 
 // Checks that prerenders are aborted on cross-process navigation from
 // a client redirect.
 IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest,
                        PrerenderCrossProcessClientRedirect) {
   // Cross-process navigation logic for renderer-initiated navigations
   // is partially controlled by the renderer, namely
   // ChromeContentRendererClient. This test instead relies on the Web
   // Store triggering such navigations.
-  std::string webstore_url = extension_urls::GetWebstoreLaunchURL();
+  GURL webstore_url = extension_urls::GetWebstoreLaunchURL();
 
   // Mock out requests to the Web Store.
   base::FilePath file(GetTestPath("prerender_page.html"));
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
-      base::Bind(&CreateMockInterceptorOnIO, GURL(webstore_url), file));
+      base::Bind(&CreateMockInterceptorOnIO, webstore_url, file));
 
-  PrerenderTestURL(CreateClientRedirect(webstore_url),
+  PrerenderTestURL(CreateClientRedirect(webstore_url.spec()),
                    FINAL_STATUS_OPEN_URL, 1);
 }
 
 // Checks that a deferred redirect to an image is not loaded until the page is
 // visible. Also test the right histogram events are emitted in this case.
 IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderDeferredImage) {
   DisableJavascriptCalls();
 
   // The prerender will not completely load until after the swap, so wait for a
   // title change before calling DidPrerenderPass.
@@ skipping 426 matching lines @@
       browser()->tab_strip_model()->GetActiveWebContents();
   bool display_test_result = false;
   ASSERT_TRUE(content::ExecuteScriptAndExtractBool(web_contents,
                                                    "DidDisplayReallyPass()",
                                                    &display_test_result));
   ASSERT_TRUE(display_test_result);
 }
 #endif  // !defined(DISABLE_NACL)
 
 }  // namespace prerender