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

chrome/browser/sync/glue/session_model_associator_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 <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/browser/sessions/session_types.h"
@@ skipping 357 matching lines @@
   EXPECT_EQ(kTime2,
             SessionTypesTestHelper::GetTimestamp(session_tab.navigations[1]));
   EXPECT_EQ(kTime3,
             SessionTypesTestHelper::GetTimestamp(session_tab.navigations[2]));
   EXPECT_TRUE(session_tab.session_storage_persistent_id.empty());
 }
 
 // Create tab specifics with an empty favicon. Ensure it gets ignored and not
 // stored into the synced favicon lookups.
 TEST_F(SyncSessionModelAssociatorTest, LoadEmptyFavicon) {
-  std::string favicon = "";
+  std::string favicon;
   std::string favicon_url = "http://www.faviconurl.com/favicon.ico";
   std::string page_url = "http://www.faviconurl.com/page.html";
   sync_pb::SessionTab tab;
   tab.set_favicon(favicon);
   tab.set_favicon_source(favicon_url);
   tab.set_favicon_type(sync_pb::SessionTab::TYPE_WEB_FAVICON);
   sync_pb::TabNavigation* navigation = tab.add_navigation();
   navigation->set_virtual_url(page_url);
   tab.set_current_navigation_index(0);
 
@@ skipping 75 matching lines @@
   // The new page should be mapped to the old favicon data.
   EXPECT_TRUE(FaviconEquals(GURL(page_url2), std::string()));
   LoadTabFavicon(tab2);
   EXPECT_TRUE(FaviconEquals(GURL(page_url), favicon));
   EXPECT_TRUE(FaviconEquals(GURL(page_url2), favicon));
 }
 
 }  // namespace
 
 }  // namespace browser_sync