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

chrome/common/extensions/extension_sync_type_unittest.cc

 // Copyright (c) 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 "base/files/file_path.h"
 #include "chrome/common/extensions/api/plugins/plugins_handler.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "chrome/common/extensions/extension_unittest.h"
 #include "chrome/common/extensions/manifest.h"
 #include "chrome/common/extensions/manifest_url_handler.h"
@@ skipping 38 matching lines @@
       source.SetString(keys::kUpdateURL, update_url.spec());
     }
     if (!launch_url.is_empty()) {
       source.SetString(keys::kLaunchWebURL, launch_url.spec());
     }
     if (type != THEME) {
       source.SetBoolean(keys::kConvertedFromUserScript, type == USER_SCRIPT);
       ListValue* plugins = new ListValue();
       for (int i = 0; i < num_plugins; ++i) {
         DictionaryValue* plugin = new DictionaryValue();
-        plugin->SetString(keys::kPluginsPath, "");
+        plugin->SetString(keys::kPluginsPath, std::string());
         plugins->Set(i, plugin);
       }
       source.Set(keys::kPlugins, plugins);
     }
 
     std::string error;
     scoped_refptr<Extension> extension = Extension::Create(
         extension_path, location, source, creation_flags, &error);
     EXPECT_TRUE(extension);
     EXPECT_EQ("", error);
@@ skipping 81 matching lines @@
                             Extension::NO_FLAGS));
   EXPECT_TRUE(app->ShouldDisplayInAppLauncher());
   EXPECT_TRUE(app->ShouldDisplayInNewTabPage());
 }
 
 TEST_F(ExtensionSyncTypeTest, DisplayInXManifestProperties) {
   DictionaryValue manifest;
   manifest.SetString(keys::kName, "TestComponentApp");
   manifest.SetString(keys::kVersion, "0.0.0.0");
   manifest.SetString(keys::kApp, "true");
-  manifest.SetString(keys::kPlatformAppBackgroundPage, "");
+  manifest.SetString(keys::kPlatformAppBackgroundPage, std::string());
 
   std::string error;
   scoped_refptr<Extension> app;
 
   // Default to true.
   app = Extension::Create(
       base::FilePath(), Manifest::COMPONENT, manifest, 0, &error);
   EXPECT_EQ(error, std::string());
   EXPECT_TRUE(app->ShouldDisplayInAppLauncher());
   EXPECT_TRUE(app->ShouldDisplayInNewTabPage());
@@ skipping 68 matching lines @@
   scoped_refptr<Extension> extension(
       MakeSyncTestExtension(EXTENSION, GURL(), GURL(),
                             Manifest::INTERNAL, 2, base::FilePath(),
                             Extension::NO_FLAGS));
   if (extension)
     EXPECT_EQ(extension->GetSyncType(), Extension::SYNC_TYPE_NONE);
 }
 #endif // !defined(OS_CHROMEOS)
 
 }  // namespace extensions