Rewrite std::string("") to std::string(), Linux edition.

chrome/browser/search/local_omnibox_popup_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/local_omnibox_popup_source.h"
 
 #include "base/logging.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
@@ skipping 58 matching lines @@
     const std::string& path) const {
   if (path == kHtmlFilename)
     return "text/html";
   if (path == kJSFilename)
     return "application/javascript";
   if (path == kCssFilename)
     return "text/css";
   if (path == kPageIconFilename || path == kPageIcon2xFilename ||
       path == kSearchIconFilename || path == kSearchIcon2xFilename)
     return "image/png";
-  return "";
+  return std::string();
 }
 
 bool LocalOmniboxPopupSource::ShouldServiceRequest(
     const net::URLRequest* request) const {
   DCHECK(request->url().host() == chrome::kChromeSearchLocalOmniboxPopupHost);
 
   if (request->url().SchemeIs(chrome::kChromeSearchScheme)) {
     DCHECK(StartsWithASCII(request->url().path(), "/", true));
     std::string filename = request->url().path().substr(1);
     return filename == kHtmlFilename || filename == kJSFilename ||
            filename == kCssFilename || filename == kPageIconFilename ||
            filename == kPageIcon2xFilename || filename == kSearchIconFilename ||
            filename == kSearchIcon2xFilename;
   }
   return false;
 }
 
 std::string LocalOmniboxPopupSource::GetContentSecurityPolicyFrameSrc() const {
   // Allow embedding of chrome search suggestion host.
   return base::StringPrintf("frame-src %s://%s/;",
                             chrome::kChromeSearchScheme,
                             chrome::kChromeSearchSuggestionHost);
 }