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

chrome/browser/extensions/extension_pref_value_map_unittest.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 "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_store_observer_mock.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_pref_value_map.h"
@@ skipping 27 matching lines @@
   static const extensions::ExtensionPrefsScope kRegularOnly =
       extensions::kExtensionPrefsScopeRegularOnly;
   static const extensions::ExtensionPrefsScope kIncognitoPersistent =
       extensions::kExtensionPrefsScopeIncognitoPersistent;
   static const extensions::ExtensionPrefsScope kIncognitoSessionOnly =
       extensions::kExtensionPrefsScopeIncognitoSessionOnly;
 
   // Returns an empty string if the key is not set.
   std::string GetValue(const char * key, bool incognito) const {
     const Value *value = epvm_.GetEffectivePrefValue(key, incognito, NULL);
-    std::string string_value = "";
+    std::string string_value;
     if (value)
       value->GetAsString(&string_value);
     return string_value;
   }
 
  protected:
   ExtensionPrefValueMap epvm_;
 };
 
 class ExtensionPrefValueMapTest
@@ skipping 332 matching lines @@
         OverrideIncognitoTestCase(1, 0, 0, 0,  5, 0, 0, 0,  5, 5),
         OverrideIncognitoTestCase(1, 2, 3, 0,  5, 0, 0, 0,  5, 5),
         OverrideIncognitoTestCase(1, 0, 0, 0,  0, 6, 0, 0,  6, 1),
         OverrideIncognitoTestCase(1, 0, 3, 0,  5, 6, 0, 0,  6, 5),
         OverrideIncognitoTestCase(1, 0, 0, 4,  5, 6, 0, 0,  6, 5),
         OverrideIncognitoTestCase(1, 0, 0, 0,  0, 0, 7, 0,  1, 7),
         OverrideIncognitoTestCase(1, 2, 0, 0,  5, 0, 7, 0,  5, 7),
         OverrideIncognitoTestCase(1, 2, 0, 0,  5, 0, 0, 8,  5, 8),
         OverrideIncognitoTestCase(1, 2, 0, 0,  5, 0, 7, 8,  5, 8),
         OverrideIncognitoTestCase(1, 2, 3, 0,  0, 6, 7, 0,  6, 7)));