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

ui/gl/gl_surface.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 "ui/gl/gl_surface.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 71 matching lines @@
 bool GLSurface::Resize(const gfx::Size& size) {
   NOTIMPLEMENTED();
   return false;
 }
 
 bool GLSurface::DeferDraws() {
   return false;
 }
 
 std::string GLSurface::GetExtensions() {
-  return std::string("");
+  return std::string();
 }
 
 bool GLSurface::HasExtension(const char* name) {
   std::string extensions = GetExtensions();
   extensions += " ";
 
   std::string delimited_name(name);
   delimited_name += " ";
 
   return extensions.find(delimited_name) != std::string::npos;
@@ skipping 142 matching lines @@
   return surface_->GetFormat();
 }
 
 VSyncProvider* GLSurfaceAdapter::GetVSyncProvider() {
   return surface_->GetVSyncProvider();
 }
 
 GLSurfaceAdapter::~GLSurfaceAdapter() {}
 
 }  // namespace gfx