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

chrome/test/webdriver/webdriver_session.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/test/webdriver/webdriver_session.h"
 
 #include <sstream>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 924 matching lines @@
       &region_offset);
   if (error)
     return error;
 
   for (FramePath frame_path = current_target_.frame_path;
        frame_path.IsSubframe();
        frame_path = frame_path.Parent()) {
     // Find the frame element for the current frame path.
     FrameId frame_id(current_target_.view_id, frame_path.Parent());
     ElementId frame_element;
-    error = FindElement(
-        frame_id, ElementId(""),
-        LocatorType::kXpath, frame_path.BaseName().value(), &frame_element);
+    error = FindElement(frame_id,
+                        ElementId(std::string()),
+                        LocatorType::kXpath,
+                        frame_path.BaseName().value(),
+                        &frame_element);
     if (error) {
       std::string context = base::StringPrintf(
           "Could not find frame element (%s) in frame (%s)",
           frame_path.BaseName().value().c_str(),
           frame_path.Parent().value().c_str());
       error->AddDetails(context);
       return error;
     }
     // Modify |region_offset| by the frame's border.
     int border_left, border_top;
@@ skipping 978 matching lines @@
        !iter.IsAtEnd(); iter.Advance()) {
     Error* error = SetPreference(iter.key(), false /* is_user_pref */,
                                  iter.value().DeepCopy());
     if (error)
       return error;
   }
   return NULL;
 }
 
 }  // namespace webdriver