pdfviewer: make pdfviewer compile on mac

experimental/PdfViewer/pdfparser/native/SkPdfNativeTokenizer.h

 #ifndef EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKPDFNATIVETOKENIZER_H_
 #define EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKPDFNATIVETOKENIZER_H_
 
 #include "SkTDArray.h"
 #include "SkTDict.h"
 #include <math.h>
 #include <string.h>
 
-class SkPdfMapper;
 class SkPdfDictionary;
 class SkPdfImageDictionary;
 
 // White Spaces
 #define kNUL_PdfWhiteSpace '\x00'
 #define kHT_PdfWhiteSpace  '\x09'
 #define kLF_PdfWhiteSpace  '\x0A'
 #define kFF_PdfWhiteSpace  '\x0C'
 #define kCR_PdfWhiteSpace  '\x0D'
 #define kSP_PdfWhiteSpace  '\x20'
@@ skipping 101 matching lines @@
     const char*      fKeyword;
     size_t           fKeywordLength;
     SkPdfNativeObject*     fObject;
     SkPdfTokenType   fType;
 
     PdfToken() : fKeyword(NULL), fKeywordLength(0), fObject(NULL) {}
 };
 
 class SkPdfNativeTokenizer {
 public:
-    SkPdfNativeTokenizer(SkPdfNativeObject* objWithStream, const SkPdfMapper* mapper, SkPdfAllocator* allocator, SkPdfNativeDoc* doc);
-    SkPdfNativeTokenizer(const unsigned char* buffer, int len, const SkPdfMapper* mapper, SkPdfAllocator* allocator, SkPdfNativeDoc* doc);
+    SkPdfNativeTokenizer(SkPdfNativeObject* objWithStream, SkPdfAllocator* allocator, SkPdfNativeDoc* doc);
+    SkPdfNativeTokenizer(const unsigned char* buffer, int len, SkPdfAllocator* allocator, SkPdfNativeDoc* doc);
 
     virtual ~SkPdfNativeTokenizer();
 
     bool readToken(PdfToken* token);
     bool readTokenCore(PdfToken* token);
     void PutBack(PdfToken token);
     SkPdfImageDictionary* readInlineImage();
 
 private:
     SkPdfNativeDoc* fDoc;
-    const SkPdfMapper* fMapper;
     SkPdfAllocator* fAllocator;
 
     const unsigned char* fUncompressedStreamStart;
     const unsigned char* fUncompressedStream;
     const unsigned char* fUncompressedStreamEnd;
 
     bool fEmpty;
     bool fHasPutBack;
     PdfToken fPutBack;
 };
 
 #endif  // EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKPDFNATIVETOKENIZER_H_