[iOS] Add assert_no_deps to //build/config/ios/rules.gni "app" template.

build/config/ios/rules.gni

 # 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.
 
 import("//build/config/ios/ios_sdk.gni")
 
 # TODO(crbug.com/297668): refactor this template to extract common behaviour
 # between OS X and iOS bundle generation, then create a generic "app" template
 # that forward to "executable" on all platform except iOS/OS X.
 
@@ skipping 93 matching lines @@
                              "entitlements_path",
                              "info_plist",
                              "visibility",
                            ])
 
     output_name = rebase_path("$target_gen_dir/$_app_name", root_build_dir)
     if (!defined(libs)) {
       libs = []
     }
     libs += [ "UIKit.framework" ]
+
+    if (is_ios) {
+      assert_no_deps = [

[brettw, 2016/03/15 18:04:17]

I think we should forward this from the invoker to the executable target here
and then the app declaration itself can decide what it depends on.

+        # Those dependencies are conceptually bad on iOS and should never be
+        # added (they will never be supported).
+        "//cc/*",
+        "//content/*",
+        "//dbus/*",
+        "//ipc/*",
+        "//jingle/*",
+        "//media/*",
+        "//third_party/webrtc/*",
+        "//third_party/WebKit/*",
+
+        # Those dependencies are conceptually fine, but currently does not
+        # build on iOS. The exclusion will be removed when the dependencies
+        # are fixed.
+        "//mojo/edk/*",
+      ]
+    }
   }
 
   bundle_data(_bundle_data_executable) {
     forward_variables_from(invoker, [ "testonly" ])
     visibility = [ ":$_target_name" ]
     sources = [
       "$target_gen_dir/$_app_name",
     ]
     outputs = [
       "{{bundle_executable_dir}}/$_app_name",
@@ skipping 33 matching lines @@
     bundle_executable_dir = bundle_root_dir
     bundle_plugins_dir = "$bundle_root_dir/Plugins"
   }
 
   # TODO(crbug.com/297668):
   # - add support for codesigning,
   # - find a way to make "ninja -C out/Default base_unittests.app" work as
   #   an alias to "ninja -C out/Default base_unittests" (for convenience
   #   and compatibility with gyp),
 }