Delete Mac & Cairo skia::BitmapPlatformDevice impls

skia/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//printing/features/features.gni")
 import("//testing/test.gni")
 import("//third_party/skia/gn/shared_sources.gni")
@@ skipping 349 matching lines @@
       # Retain the files for the SkFontMgr_Android on linux to emulate android
       # fonts. See content/zygote/zygote_main_linux.cc
       "//third_party/skia/src/ports/SkFontMgr_android.cpp",
       "//third_party/skia/src/ports/SkFontMgr_android_parser.cpp",
     ]
   }
 
   # Select the right BitmapPlatformDevice.
   if (is_win) {
     sources += [ "ext/bitmap_platform_device_win.cc" ]
-  } else if (is_mac) {
-    sources += [ "ext/bitmap_platform_device_mac.cc" ]
-  } else if (use_cairo) {
-    sources += [ "ext/bitmap_platform_device_cairo.cc" ]
   } else if (!is_ios) {
     sources += [ "ext/bitmap_platform_device_skia.cc" ]
   }
 
   if (is_clang && !is_nacl) {
     # Skia won't compile with some of the more strict clang warnings.
     # e.g. it does:
     #  SkASSERT(!"sk_out_of_memory");
     configs -= [ "//build/config/clang:extra_warnings" ]
   }
@@ skipping 320 matching lines @@
 
     deps = [
       ":skia",
       "//base",
       "//base/test:test_support",
       "//build/config/sanitizers:deps",
       "//build/win:default_exe_manifest",
     ]
   }
 }