Revert of SkPDF: Move SkFlate into src/pdf (part 1/3)

gyp/pdf.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # This file builds the PDF backend.
 {
   'targets': [
     {
       'target_name': 'nopdf',
       'type': 'static_library',
       'dependencies': [ 'skia_lib.gyp:skia_lib', ],
       'sources': [ '<(skia_src_path)/doc/SkDocument_PDF_None.cpp', ],
       'defines': [ 'SK_SUPPORT_PDF=0', ],
     },
     {
       'target_name': 'pdf',
       'product_name': 'skia_pdf',
       'type': 'static_library',
       'standalone_static_library': 1,
       'variables': { 'skia_pdf_use_sfntly%': 1, },
       'dependencies': [
         'skia_lib.gyp:skia_lib',
-        'zlib.gyp:zlib',
+        'skflate.gyp:skflate',
       ],
       'includes': [
         'pdf.gypi',
       ],
       'include_dirs': [
         '../include/private',
         '../src/core', # needed to get SkGlyphCache.h and SkTextFormatParams.h
         '../src/pdf',
         '../src/utils', # needed to get SkBitSet.h
       ],
@@ skipping 20 matching lines @@
       ],
       'direct_dependent_settings': {
         'defines': [ 'SK_SUPPORT_PDF=1', ],
         'include_dirs': [
           '../include/core',  # SkDocument.h
         ],
       },
     },
   ],
 }