Remove unnecessary includes in src/pdf/

src/pdf/SkPDFFormXObject.h

 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPDFFormXObject_DEFINED
 #define SkPDFFormXObject_DEFINED
 
 #include "SkPDFStream.h"
-#include "SkPDFTypes.h"
-#include "SkRect.h"
-#include "SkRefCnt.h"
-#include "SkString.h"
 
-class SkMatrix;
+class SkPDFArray;
 class SkPDFDevice;
-class SkPDFObjNumMap;
+class SkPDFDict;
+struct SkRect;
 
 /** \class SkPDFFormXObject
 
     A form XObject; a self contained description of graphics objects.  A form
     XObject is basically a page object with slightly different syntax, that
     can be drawn onto a page.
 */
 
 // The caller could keep track of the form XObjects it creates and
 // canonicalize them, but the Skia API doesn't provide enough context to
@@ skipping 13 matching lines @@
                               SkRect bbox,
                               SkPDFDict* resourceDict);
     virtual ~SkPDFFormXObject();
 
 private:
     void init(const char* colorSpace,
               SkPDFDict* resourceDict, SkPDFArray* bbox);
 };
 
 #endif