Remove unnecessary Document.h includes in .cpp files

Source/web/tests/WebPageSerializerTest.cpp

 /*
  * Copyright (C) 2011 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 13 matching lines @@
  * 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 "public/web/WebPageSerializer.h"
 
-#include "core/dom/Document.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
 #include "public/platform/WebURLRequest.h"
 #include "public/platform/WebURLResponse.h"
 #include "public/platform/WebUnitTestSupport.h"
 #include "public/web/WebDocument.h"
 #include "public/web/WebFrame.h"
 #include "public/web/WebView.h"
 #include "web/tests/FrameTestHelpers.h"
@@ skipping 129 matching lines @@
     EXPECT_TRUE(webVectorContains(resources, "http://www.test.com/innerFrame.png"));
     EXPECT_TRUE(webVectorContains(resources, "http://www.test.com/flash.swf"));
     // FIXME: for some reason the following resources is missing on one of the bot
     //        causing the test to fail. Probably a plugin issue.
     // EXPECT_TRUE(webVectorContains(resources, "http://www.test.com/music.mid"));
     EXPECT_TRUE(webVectorContains(resources, "http://www.test.com/object.png"));
     EXPECT_TRUE(webVectorContains(resources, "http://www.test.com/embed.png"));
 }
 
 }