[WIP] make GURL::path() return a StringPiece

chrome/browser/search/most_visited_iframe_source.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/search/most_visited_iframe_source.h"
 
 #include "base/command_line.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 31 matching lines @@
 
 std::string MostVisitedIframeSource::GetSource() const {
   return chrome::kChromeSearchMostVisitedHost;
 }
 
 void MostVisitedIframeSource::StartDataRequest(
     const std::string& path_and_query,
     const content::ResourceRequestInfo::WebContentsGetter& wc_getter,
     const content::URLDataSource::GotDataCallback& callback) {
   GURL url(chrome::kChromeSearchMostVisitedUrl + path_and_query);
-  std::string path(url.path());
+  base::StringPiece path(url.path());
 
 #if !defined(GOOGLE_CHROME_BUILD)
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kLocalNtpReload)) {
-    std::string rel_path = "most_visited_" + path.substr(1);
+    std::string rel_path = "most_visited_" + path.substr(1).as_string();
     if (path == kSingleJSPath) {
       std::string origin;
       if (!GetOrigin(wc_getter, &origin)) {
         callback.Run(nullptr);
         return;
       }
       local_ntp::SendLocalFileResourceWithOrigin(rel_path, origin, callback);
     } else {
       local_ntp::SendLocalFileResource(rel_path, callback);
     }
@@ skipping 28 matching lines @@
   }
 }
 
 bool MostVisitedIframeSource::ServesPath(const std::string& path) const {
   return path == kTitleHTMLPath || path == kTitleCSSPath ||
          path == kTitleJSPath || path == kThumbnailHTMLPath ||
          path == kThumbnailCSSPath || path == kThumbnailJSPath ||
          path == kSingleHTMLPath || path == kSingleCSSPath ||
          path == kSingleJSPath || path == kUtilJSPath || path == kCommonCSSPath;
 }