Moved media mime type and codec checks to media/base/mime_util.*

components/mime_util/BUILD.gn

 # 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.
 
 static_library("mime_util") {
   sources = [
     "mime_util.cc",
     "mime_util.h",
   ]
 
   deps = [
     "//base",
+    "//media",
     "//net",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "mime_util_unittest.cc",
   ]
 
   deps = [
     ":mime_util",
     "//base",
     "//testing/gtest",
   ]
 }