Reduce string copies in GURL creation

chrome/renderer/page_load_histograms.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 "chrome/renderer/page_load_histograms.h"
 
 #include <stddef.h>
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/renderer/searchbox/search_bouncer.h"
 #include "components/data_reduction_proxy/content/common/data_reduction_proxy_messages.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
+#include "content/public/child/url_conversion.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/renderer/document_state.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/render_view.h"
 #include "extensions/common/url_pattern.h"
 #include "net/base/url_util.h"
 #include "net/http/http_response_headers.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "third_party/WebKit/public/platform/WebURLResponse.h"
@@ skipping 867 matching lines @@
   bool data_reduction_proxy_was_used = false;
   if (!document_state->proxy_server().IsEmpty()) {
     bool handled =
         Send(new DataReductionProxyViewHostMsg_IsDataReductionProxy(
             document_state->proxy_server(), &data_reduction_proxy_was_used));
     // If the IPC call is not handled, then |data_reduction_proxy_was_used|
     // should remain |false|.
     DCHECK(handled || !data_reduction_proxy_was_used);
   }
 
-  bool came_from_websearch =
-      IsFromGoogleSearchResult(frame->document().url(),
-                               GURL(frame->document().referrer()));
+  bool came_from_websearch = IsFromGoogleSearchResult(
+      frame->document().url(),
+      content::WebStringToGURL(frame->document().referrer()));
   int websearch_chrome_joint_experiment_id = kNoExperiment;
   bool is_preview = false;
   if (came_from_websearch) {
-    websearch_chrome_joint_experiment_id =
-        GetQueryStringBasedExperiment(GURL(frame->document().referrer()));
+    websearch_chrome_joint_experiment_id = GetQueryStringBasedExperiment(
+        content::WebStringToGURL(frame->document().referrer()));
     is_preview = ViaHeaderContains(frame, "1.1 Google Instant Proxy Preview");
   }
 
   MaybeDumpFirstLayoutHistograms();
 
   content::RenderFrame* render_frame =
       content::RenderFrame::FromWebFrame(frame);
 
   // Metrics based on the timing information recorded for the Navigation Timing
   // API - http://www.w3.org/TR/navigation-timing/.
@@ skipping 112 matching lines @@
 
   DCHECK(document_state);
   DCHECK(ds);
   GURL url(ds->request().url());
   Time start = document_state->start_load_time();
   Time finish = document_state->finish_load_time();
   // TODO(mbelshe): should we log more stats?
   VLOG(1) << "PLT: " << (finish - start).InMilliseconds() << "ms "
           << url.spec();
 }