Make ChromeAutofillClient a ZoomObserver.

chrome/browser/ui/autofill/chrome_autofill_client.h

Index: chrome/browser/ui/autofill/chrome_autofill_client.h
diff --git a/chrome/browser/ui/autofill/chrome_autofill_client.h b/chrome/browser/ui/autofill/chrome_autofill_client.h
index 2893ca7f1eab7f24599c7f593a2d09d8b5885d5c..ac5fa76ce0f6ec8a86e2979e652e2f4cfff27620 100644
--- a/chrome/browser/ui/autofill/chrome_autofill_client.h
+++ b/chrome/browser/ui/autofill/chrome_autofill_client.h
@@ -9,6 +9,7 @@
 #include "base/compiler_specific.h"
 #include "base/i18n/rtl.h"
 #include "base/memory/weak_ptr.h"
+#include "chrome/browser/ui/zoom/zoom_observer.h"
 #include "components/autofill/core/browser/autofill_client.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
@@ -30,7 +31,8 @@ struct FormData;
 class ChromeAutofillClient
     : public AutofillClient,
       public content::WebContentsUserData<ChromeAutofillClient>,
-      public content::WebContentsObserver {
+      public content::WebContentsObserver,
+      public ZoomObserver {
  public:
   virtual ~ChromeAutofillClient();
 
@@ -72,6 +74,10 @@ class ChromeAutofillClient
   // content::WebContentsObserver implementation.
   virtual void WebContentsDestroyed() OVERRIDE;
 
+  // ZoomObserver implementation.
+  virtual void OnZoomChanged(
+      const ZoomController::ZoomChangedEventData& data) OVERRIDE;
+
   // Exposed for testing.
   AutofillDialogController* GetDialogControllerForTesting() {
     return dialog_controller_.get();