[Autofill] Migrate ContentPasswordManagerDriver<-->Password{Autofill,Generation}Agent IPCs to mojo.

components/autofill/content/common/BUILD.gn

 # Copyright 2014 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.
 
 # GYP version: components:autofill.gypi:autofill_content_common
 static_library("common") {
   sources = [
     "autofill_message_generator.cc",
     "autofill_message_generator.h",
     "autofill_messages.h",
     "autofill_param_traits_macros.h",
   ]
 
-  public_deps = [
-    # This is indirectly required by autofill_messages because it includes
-    # some blink headers that include Skia.
-    "//skia",
-  ]
   deps = [
     "//base",
     "//components/autofill/core/common",
     "//content/public/common",
     "//ipc",
-    "//third_party/WebKit/public:blink_minimal",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gfx/ipc",
     "//ui/gfx/ipc/geometry",
-    "//ui/gfx/ipc/skia",
     "//url",
   ]
 }