Remove unused CFX_QuartzDevice(Driver) classes.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 48b85c16b81112789136b796421ff10fe0e24c8b..904467e376f699d0f9482ed9d33e154b266f9b8f 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -759,10 +759,6 @@ static_library("fxge") {
     "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",
@@ -854,9 +850,12 @@ static_library("fxge") {
     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) {
@@ -871,6 +870,14 @@ static_library("fxge") {
     ]
     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") {