MacViews: Implemented Drag & Drop

ui/base/BUILD.gn

Index: ui/base/BUILD.gn
diff --git a/ui/base/BUILD.gn b/ui/base/BUILD.gn
index 6256fac621ca03969aa7fc3ee8197ec772204e49..5b61cdce8340ee5ce0184857a859deccdefea3b8 100644
--- a/ui/base/BUILD.gn
+++ b/ui/base/BUILD.gn
@@ -151,11 +151,10 @@ component("base") {
     "device_form_factor_desktop.cc",
     "device_form_factor_ios.mm",
     "dragdrop/drag_drop_types.h",
+    "dragdrop/drag_drop_types_mac.mm",
     "dragdrop/drag_drop_types_win.cc",
     "dragdrop/drag_source_win.cc",
     "dragdrop/drag_source_win.h",
-    "dragdrop/drag_utils_aura.cc",
-    "dragdrop/drag_utils_mac.mm",
     "dragdrop/drag_utils_win.cc",
     "dragdrop/drop_target_event.cc",
     "dragdrop/drop_target_event.h",
@@ -442,7 +441,6 @@ component("base") {
     sources -= [
       "cursor/cursor.cc",
       "cursor/cursor.h",
-      "dragdrop/drag_utils_aura.cc",
     ]
   }
 
@@ -450,10 +448,6 @@ component("base") {
     sources -= [ "resource/resource_bundle_auralinux.cc" ]
   }
 
-  if (use_aura && is_win) {
-    sources -= [ "dragdrop/drag_utils_aura.cc" ]
-  }
-
   if (is_linux) {
     deps += [ "//build/linux:fontconfig" ]
   }
@@ -521,8 +515,6 @@ component("base") {
     sources -= [
       "cursor/image_cursors.cc",
       "cursor/image_cursors.h",
-      "dragdrop/drag_utils.cc",
-      "dragdrop/drag_utils.h",
     ]
 
     libs += [