PDF: Yet another stab at getting WriteInto() buffer sizes correct.

pdf/pdf.gyp

 {
   'variables': {
     'chromium_code': 1,
     'pdf_engine%': 0,  # 0 PDFium
   },
   'target_defaults': {
     'cflags': [
       '-fPIC',
     ],
   },
@@ skipping 53 matching lines @@
         'resource.h',
         'resource_consts.h',
         'thumbnail_control.cc',
         'thumbnail_control.h',
         '../chrome/browser/chrome_page_zoom_constants.cc',
         '../content/common/page_zoom.cc',
       ],
       'conditions': [
         ['pdf_engine==0', {
           'sources': [
+            'pdfium/pdfium_api_string_buffer_adapter.cc',
+            'pdfium/pdfium_api_string_buffer_adapter.h',
             'pdfium/pdfium_assert_matching_enums.cc',
             'pdfium/pdfium_engine.cc',
             'pdfium/pdfium_engine.h',
             'pdfium/pdfium_mem_buffer_file_read.cc',
             'pdfium/pdfium_mem_buffer_file_read.h',
             'pdfium/pdfium_mem_buffer_file_write.cc',
             'pdfium/pdfium_mem_buffer_file_write.h',
             'pdfium/pdfium_page.cc',
             'pdfium/pdfium_page.h',
             'pdfium/pdfium_range.cc',
@@ skipping 107 matching lines @@
                 '--input_symbol', '<(PRODUCT_DIR)/pdf.dll.pdb',
                 '--destination_dir', '<(dest_dir)',
               ],
             },
           ],
         },
       ],
     }],  # OS=="win" and fastbuild==0 and target_arch=="ia32" and syzyasan==1
   ],
 }