GURL::Replacements methods accept a StringPiece instead of std::string&.

chrome/browser/search/search.cc

 // Copyright 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/browser/search/search.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
@@ skipping 468 matching lines @@
   if (!instant_url.is_valid() ||
       !template_url->HasSearchTermsReplacementKey(instant_url))
     return GURL();
 
   // Extended mode requires HTTPS.  Force it unless the base URL was overridden
   // on the command line, in which case we allow HTTP (see comments on
   // IsSuitableURLForInstant()).
   if (!instant_url.SchemeIsSecure() &&
       !google_util::StartsWithCommandLineGoogleBaseURL(instant_url)) {
     GURL::Replacements replacements;
-    const std::string secure_scheme(url::kHttpsScheme);
-    replacements.SetSchemeStr(secure_scheme);
+    replacements.SetSchemeStr(url::kHttpsScheme);
     instant_url = instant_url.ReplaceComponents(replacements);
   }
 
   if (!IsURLAllowedForSupervisedUser(instant_url, profile))
     return GURL();
 
   if (ShouldUseAltInstantURL()) {
     GURL::Replacements replacements;
       const std::string path(
           ShouldUseSearchPathForInstant() ? kAltInstantURLPath : std::string());
@@ skipping 241 matching lines @@
       kUseAltInstantURL, false, flags);
 }
 
 bool ShouldUseSearchPathForInstant() {
   FieldTrialFlags flags;
   return GetFieldTrialInfo(&flags) && GetBoolValueForFlagWithDefault(
       kUseSearchPathForInstant, false, flags);
 }
 
 }  // namespace chrome