Media Remoting: Add mojo interfaces between browser and extension.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 657 matching lines @@
   }
 
   if ((is_linux && !is_chromeos && !is_chromecast) || (is_win && use_drfuzz) ||
       (use_libfuzzer && is_mac)) {
     deps += [
       "//testing/libfuzzer/fuzzers",
       "//testing/libfuzzer/tests:libfuzzer_tests",
       "//third_party/icu/fuzzers",
       "//third_party/qcms:fuzzers",
     ]
-
-    # TODO(miu): Remove this dependency once the build configuration in
-    # chrome/browser/BUILD.gn is migrated to chrome/browser/media/BUILD.gn.
-    # This dependency here only exists to allow GN to discover the
-    # fuzzer_test target there.
-    deps += [ "//chrome/browser/media:cast_remoting_connector_fuzzer" ]
   }
 
   if (enable_nacl) {
     deps += [ "//native_client_sdk/src:nacl_core_sdk" ]
   }
 
   if (is_linux && use_ozone) {
     deps += [
       "//headless",
       "//headless:headless_tests",
@@ skipping 369 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }