Remove unnecessary Document.h includes in .cpp files

Source/web/tests/WebPageNewSerializerTest.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 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 "public/platform/Platform.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebThread.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/WebPageSerializer.h"
@@ skipping 446 matching lines @@
     // exactly two times.
     size_t nbDataURLs = 0;
     LineReader lineReader(std::string(mhtmlData.data()));
     std::string line;
     while (lineReader.getNextLine(&line)) {
         if (line.find("data:text") != std::string::npos)
             nbDataURLs++;
     }
     EXPECT_EQ(2u, nbDataURLs);
 }