Decompose //extensions/browser/BUILD.gn

extensions/browser/api/mime_handler_private/BUILD.gn

Index: extensions/browser/api/mime_handler_private/BUILD.gn
diff --git a/components/browser_sync/common/BUILD.gn b/extensions/browser/api/mime_handler_private/BUILD.gn
similarity index 57%
copy from components/browser_sync/common/BUILD.gn
copy to extensions/browser/api/mime_handler_private/BUILD.gn
index 2715ae90bd9c1df5766988dc4e6c011f17a65e4a..e64bfb5853fc1918b5194e0cbaa77356f59ce634 100644
--- a/components/browser_sync/common/BUILD.gn
+++ b/extensions/browser/api/mime_handler_private/BUILD.gn
@@ -1,16 +1,14 @@
 # Copyright 2015 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")
-
-static_library("common") {
+source_set("mime_handler_private") {
   sources = [
-    "browser_sync_switches.cc",
-    "browser_sync_switches.h",
+    "mime_handler_private.cc",
+    "mime_handler_private.h",
   ]
 
   deps = [
-    "//base",
+    "//content/public/browser",
+    "//skia",
   ]
 }