Add text field change handling for autofill preview in textarea element.

Source/web/tests/WebViewTest.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1069 matching lines @@
 class MockAutofillClient : public WebAutofillClient {
 public:
     MockAutofillClient()
         : m_ignoreTextChanges(false)
         , m_textChangesWhileIgnored(0)
         , m_textChangesWhileNotIgnored(0) { }
 
     virtual ~MockAutofillClient() { }
 
     virtual void setIgnoreTextChanges(bool ignore) OVERRIDE { m_ignoreTextChanges = ignore; }
-    virtual void textFieldDidChange(const WebInputElement&) OVERRIDE
+    virtual void textFieldDidChange(const WebFormControlElement&) OVERRIDE
     {
         if (m_ignoreTextChanges)
             ++m_textChangesWhileIgnored;
         else
             ++m_textChangesWhileNotIgnored;
     }
 
     void clearChangeCounts()
     {
         m_textChangesWhileIgnored = 0;
@@ skipping 514 matching lines @@
     EXPECT_EQ(0, client.getAndResetHasTouchEventHandlerCallCount(false));
     EXPECT_EQ(0, client.getAndResetHasTouchEventHandlerCallCount(true));
 
     // Now removing the handler in the parent document results in a no-handlers call.
     document->didRemoveTouchEventHandler(childFrame);
     EXPECT_EQ(1, client.getAndResetHasTouchEventHandlerCallCount(false));
     EXPECT_EQ(0, client.getAndResetHasTouchEventHandlerCallCount(true));
 }
 
 } // namespace