Remove unnecessary Document.h includes in .cpp files

Source/core/dom/ActiveDOMObjectTest.cpp

 /*
  * Copyright (c) 2014, 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 11 matching lines @@
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
-#include "core/dom/Document.h"
 
 #include "core/testing/DummyPageHolder.h"
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 
 using namespace WebCore;
 
 namespace {
 
 class MockActiveDOMObject : public ActiveDOMObject {
@@ skipping 55 matching lines @@
 
 TEST_F(ActiveDOMObjectTest, MoveToStoppedDocument)
 {
     destDocument().detach();
 
     EXPECT_CALL(activeDOMObject(), stop());
     activeDOMObject().didMoveToNewExecutionContext(&destDocument());
 }
 
 } // unnamed namespace