Remove unused CFX_QuartzDevice(Driver) classes.

BUILD.gn

 # Copyright 2016 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_overrides/v8.gni")
 import("//testing/test.gni")
 import("pdfium.gni")
 
 config("pdfium_common_config") {
   cflags = []
@@ skipping 741 matching lines @@
     "core/fxge/android/cfpf_skiafilefont.h",
     "core/fxge/android/cfpf_skiafont.cpp",
     "core/fxge/android/cfpf_skiafont.h",
     "core/fxge/android/cfpf_skiafontdescriptor.h",
     "core/fxge/android/cfpf_skiafontmgr.cpp",
     "core/fxge/android/cfpf_skiafontmgr.h",
     "core/fxge/android/cfpf_skiapathfont.h",
     "core/fxge/android/cfx_androidfontinfo.cpp",
     "core/fxge/android/cfx_androidfontinfo.h",
     "core/fxge/android/fx_android_imp.cpp",
-    "core/fxge/apple/apple_int.h",
-    "core/fxge/apple/cfx_quartzdevice.h",
-    "core/fxge/apple/fx_mac_imp.cpp",
-    "core/fxge/apple/fx_quartz_device.cpp",
     "core/fxge/cfx_facecache.h",
     "core/fxge/cfx_fontcache.h",
     "core/fxge/cfx_fontmapper.h",
     "core/fxge/cfx_fontmgr.h",
     "core/fxge/cfx_fxgedevice.h",
     "core/fxge/cfx_gemodule.h",
     "core/fxge/cfx_graphstate.h",
     "core/fxge/cfx_graphstatedata.h",
     "core/fxge/cfx_pathdata.h",
     "core/fxge/cfx_renderdevice.h",
@@ skipping 71 matching lines @@
     ]
   }
 
   if (pdf_use_skia) {
     sources += [ "core/fxge/skia/fx_skia_device.cpp" ]
     deps += [ "//skia" ]
   } else {
     sources += [
       "core/fxge/agg/fx_agg_driver.cpp",
       "core/fxge/agg/fx_agg_driver.h",
-      "core/fxge/apple/fx_apple_platform.cpp",
     ]
     deps += [ "third_party:fx_agg" ]
+
+    if (is_mac) {
+      sources += [ "core/fxge/apple/fx_apple_platform.cpp" ]
+    }
   }
 
   if (is_win) {
     sources += [
       "core/fxge/win32/dwrite_int.h",
       "core/fxge/win32/fx_win32_device.cpp",
       "core/fxge/win32/fx_win32_dib.cpp",
       "core/fxge/win32/fx_win32_dwrite.cpp",
       "core/fxge/win32/fx_win32_gdipext.cpp",
       "core/fxge/win32/fx_win32_print.cpp",
       "core/fxge/win32/win32_int.h",
     ]
     configs -= [ "//build/config/win:lean_and_mean" ]
   }
+
+  if (is_mac) {
+    sources += [
+      "core/fxge/apple/apple_int.h",
+      "core/fxge/apple/fx_mac_imp.cpp",
+      "core/fxge/apple/fx_quartz_device.cpp",
+    ]
+  }
 }
 
 static_library("fxedit") {
   sources = [
     "fpdfsdk/fxedit/fx_edit.h",
     "fpdfsdk/fxedit/fxet_ap.cpp",
     "fpdfsdk/fxedit/fxet_edit.cpp",
     "fpdfsdk/fxedit/fxet_edit.h",
     "fpdfsdk/fxedit/fxet_list.cpp",
     "fpdfsdk/fxedit/fxet_list.h",
@@ skipping 875 matching lines @@
       "//samples",
     ]
   }
   group("fuzzers") {
     testonly = true
     deps = [
       "//testing/libfuzzer",
     ]
   }
 }