Add base:: to string16s in chrome/.

chrome/test/base/ui_test_utils.h

Index: chrome/test/base/ui_test_utils.h
diff --git a/chrome/test/base/ui_test_utils.h b/chrome/test/base/ui_test_utils.h
index b7fe6daa322af61e881e96cb4b557bacaf4495e4..15d785ebe3f2a77b0c204f827c4dbf7d390218f6 100644
--- a/chrome/test/base/ui_test_utils.h
+++ b/chrome/test/base/ui_test_utils.h
@@ -74,7 +74,7 @@ enum BrowserTestWaitFlags {
 };
 
 // Puts the current tab title in |title|. Returns true on success.
-bool GetCurrentTabTitle(const Browser* browser, string16* title);
+bool GetCurrentTabTitle(const Browser* browser, base::string16* title);
 
 // Opens |url| in an incognito browser window with the incognito profile of
 // |profile|, blocking until the navigation finishes. This will create a new
@@ -134,7 +134,7 @@ AppModalDialog* WaitForAppModalDialog();
 // of the current match. |selection_rect| is an optional parameter which is set
 // to the location of the current match.
 int FindInPage(content::WebContents* tab,
-               const string16& search_string,
+               const base::string16& search_string,
                bool forward,
                bool case_sensitive,
                int* ordinal,