Replace web_cache_messages.h with Mojo service.

components/web_cache/browser/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.
 
 source_set("browser") {
   sources = [
     "web_cache_manager.cc",
     "web_cache_manager.h",
   ]
 
   configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   deps = [
     "//base",
     "//components/prefs",
-    "//components/web_cache/common",
+    "//components/web_cache/public/interfaces",
     "//content/public/browser",
+    "//content/public/common",

[Sam McNally, 2016/03/10 22:59:34]

Should there be a corresponding addition to the gypi?

[leonhsl(Using Gerrit), 2016/03/11 02:56:24]

In components/web_cache.gypi, 'web_cache_browser' depends on --> 
'content/content.gyp:content_browser' depends on -->
'content/content.gyp:content_common', which  covers both //content/common and
//content/public/common. So no need to add deps again.

I think the root cause is that gyp has no separate targets for //content/common
and //content/public/common..

     "//third_party/WebKit/public:blink_headers",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "web_cache_manager_unittest.cc",
   ]
   deps = [
     ":browser",
     "//base",
     "//content/test:test_support",
     "//testing/gtest",
   ]
 }