Add base:: to string16 in chrome_frame/.

chrome_frame/find_dialog.h

Index: chrome_frame/find_dialog.h
diff --git a/chrome_frame/find_dialog.h b/chrome_frame/find_dialog.h
index 4adcdf0868a103f9a48cd5ddd37970615c4f1132..27eca8bcda29bc4b57508fda1ebac8a5d4df2324 100644
--- a/chrome_frame/find_dialog.h
+++ b/chrome_frame/find_dialog.h
@@ -50,7 +50,7 @@ class CFFindDialog : public CDialogImpl<CFFindDialog> {
 
   // Store the text we searched for last to determine whether we are doing a
   // "Find" or a "Find Next".
-  string16 last_find_text_;
+  base::string16 last_find_text_;
 
   // We don't own these, and they must exist at least as long as we do.
   scoped_refptr<ChromeFrameAutomationClient> automation_client_;