Use base namespace for string16 in chrome/browser.

This converts 200 more files.

TBR=sky

Review URL: https://codereview.chromium.org/108353004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239278 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/ui/browser_instant_controller.cc b/chrome/browser/ui/browser_instant_controller.cc
index e73c625..b30da97 100644
--- a/chrome/browser/ui/browser_instant_controller.cc
+++ b/chrome/browser/ui/browser_instant_controller.cc
@@ -122,7 +122,7 @@
 
   // If we will not be replacing search terms from this URL, don't send to
   // InstantController.
-  const string16& search_terms =
+  const base::string16& search_terms =
       chrome::GetSearchTermsFromURL(browser_->profile(), url);
   if (search_terms.empty())
     return false;