Replace string16 with base::string16.

chrome/browser/chromeos/ui/echo_dialog_view.h

Index: chrome/browser/chromeos/ui/echo_dialog_view.h
diff --git a/chrome/browser/chromeos/ui/echo_dialog_view.h b/chrome/browser/chromeos/ui/echo_dialog_view.h
index 517dbbb5fa7ec361d94ea6a8f48bd5a655ec833b..31faff3884a27d4e47a6a0be9d4b2f7a0e3b1a88 100644
--- a/chrome/browser/chromeos/ui/echo_dialog_view.h
+++ b/chrome/browser/chromeos/ui/echo_dialog_view.h
@@ -35,7 +35,7 @@ class EchoDialogView : public views::DialogDelegateView,
   // url. Service name should be underlined in the dialog, and hovering over its
   // label should display tooltip containing |origin|.
   // The dialog will have both OK and Cancel buttons.
-  void InitForEnabledEcho(const string16& service_name, const string16& origin);
+  void InitForEnabledEcho(const base::string16& service_name, const base::string16& origin);
 
   // Initializes dialog layout that will be shown when echo extension is not
   // allowed to redeem offers. The dialog will be showing a message that the
@@ -52,7 +52,7 @@ class EchoDialogView : public views::DialogDelegateView,
   // views::DialogDelegate overrides.
   virtual int GetDialogButtons() const OVERRIDE;
   virtual int GetDefaultDialogButton() const OVERRIDE;
-  virtual string16 GetDialogButtonLabel(ui::DialogButton button) const OVERRIDE;
+  virtual base::string16 GetDialogButtonLabel(ui::DialogButton button) const OVERRIDE;
   virtual bool Cancel() OVERRIDE;
   virtual bool Accept() OVERRIDE;