Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/sync/glue/session_sync_test_helper.cc

Index: chrome/browser/sync/glue/session_sync_test_helper.cc
diff --git a/chrome/browser/sync/glue/session_sync_test_helper.cc b/chrome/browser/sync/glue/session_sync_test_helper.cc
index 401db7c8aa6453e455866f10e4bb760b1593871a..d908288ef1421ce574dd48b572e169a5adf1118c 100644
--- a/chrome/browser/sync/glue/session_sync_test_helper.cc
+++ b/chrome/browser/sync/glue/session_sync_test_helper.cc
@@ -84,7 +84,7 @@ void SessionSyncTestHelper::VerifySyncedSession(
       ASSERT_EQ(tab->navigations[0].virtual_url(), GURL(kVirtualUrl));
       ASSERT_EQ(tab->navigations[0].referrer().url, GURL(kReferrer));
       ASSERT_EQ(tab->navigations[0].title(),
-                base::string16(ASCIIToUTF16(kTitle)));
+                base::ASCIIToUTF16(kTitle));
       ASSERT_EQ(tab->navigations[0].transition_type(),
                 content::PAGE_TRANSITION_TYPED);
     }