Remove TabContents from autofill unittests.

chrome/browser/autofill/autofill_manager.h

Index: chrome/browser/autofill/autofill_manager.h
diff --git a/chrome/browser/autofill/autofill_manager.h b/chrome/browser/autofill/autofill_manager.h
index e4d2dd135c3829930afdc779bbf1cdd9fd2f94cc..750c7ca637c8d024993fadee542a606d9a937428 100644
--- a/chrome/browser/autofill/autofill_manager.h
+++ b/chrome/browser/autofill/autofill_manager.h
@@ -77,13 +77,8 @@ class AutofillManager : public content::NotificationObserver,
   // Registers our Enable/Disable Autofill pref.
   static void RegisterUserPrefs(PrefServiceBase* prefs);
 
-  // Set our external delegate.
-  // TODO(jrg): consider passing delegate into the ctor.  That won't
-  // work if the delegate has a pointer to the AutofillManager, but
-  // future directions may not need such a pointer.
-  void SetExternalDelegate(AutofillExternalDelegate* delegate) {
-    external_delegate_ = delegate;
-  }
+  // Sets an external delegate.
+  void SetExternalDelegate(AutofillExternalDelegate* delegate);
 
   // Used to say if this class has an external delegate that it is using.
   bool HasExternalDelegate();