Replace web_cache_messages.h with Mojo service.

components/web_cache/common/BUILD.gn

Index: components/web_cache/common/BUILD.gn
diff --git a/components/web_cache/common/BUILD.gn b/components/web_cache/common/BUILD.gn
index d4b7ac70a6a3761732749f322f1ad750372e6208..c208b45bd546822020f739fea1b7caa0c91d0dbb 100644
--- a/components/web_cache/common/BUILD.gn
+++ b/components/web_cache/common/BUILD.gn
@@ -2,14 +2,10 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("common") {
-  sources = [
-    "web_cache_message_generator.cc",
-    "web_cache_message_generator.h",
-    "web_cache_messages.h",
-  ]
+import("//mojo/public/tools/bindings/mojom.gni")
 
-  deps = [
-    "//ipc",
+mojom("common") {

[Ken Rockot(use gerrit already), 2016/02/18 03:45:06]

It's a bit unconventional to have a target named "common" be a mojom target. I
think we should reinforce the convention that mojom lives in
foo/public/interfaces, so can you move this BUILD.gn, OWNERS, and the mojom file
to //components/web_cache/public/interfaces?

[leonhsl(Using Gerrit), 2016/02/18 08:56:22]

Understood and Done.

+  sources = [
+    "web_cache_service.mojom",
   ]
 }