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

chrome/browser/feedback/feedback_util.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/browser/feedback/feedback_util.h"
 
 #include <sstream>
 #include <string>
 #include <vector>
 
@@ skipping 265 matching lines @@
         version_info.Version() +
         " (" + version_info.LastChange() + ")";
     AddFeedbackData(&feedback_data, std::string(kChromeVersionTag),
                     chrome_version);
   }
 
   // We don't need the OS version for ChromeOS since we get it in
   // CHROMEOS_RELEASE_VERSION from /etc/lsb-release
 #if !defined(OS_CHROMEOS)
   // Add OS version (eg, for WinXP SP2: "5.1.2600 Service Pack 2").
-  std::string os_version = "";
+  std::string os_version;
   SetOSVersion(&os_version);
   AddFeedbackData(&feedback_data, std::string(kOsVersionTag), os_version);
 #endif
 
   // Include the page image if we have one.
   if (data->image().get() && data->image()->size()) {
     userfeedback::PostedScreenshot screenshot;
     screenshot.set_mime_type(kPngMimeType);
     // Set the dimensions of the screenshot
     userfeedback::Dimensions dimensions;
@@ skipping 112 matching lines @@
   if (screenshot_size == NULL)
     screenshot_size = new gfx::Rect();
   return *screenshot_size;
 }
 
 // static
 void FeedbackUtil::SetScreenshotSize(const gfx::Rect& rect) {
   gfx::Rect& screen_size = GetScreenshotSize();
   screen_size = rect;
 }