Remove unnecessary dependencies on mojo/edk/system

extensions/shell/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.
 
 import("//extensions/shell/app_shell.gni")
 
 # Technically, this directory should not depend on files from src/chrome, but
 # that's where the VERSION file is. This  should probably all be moved to
 # src/build.
 import("//chrome/version.gni")
@@ skipping 36 matching lines @@
     "//extensions:extensions_resources",
     "//extensions:shell_and_test_pak",
     "//extensions/browser",
     "//extensions/common",
     "//extensions/common/api",
     "//extensions/common/api:api_registration",
     "//extensions/renderer",
     "//extensions/shell/common/api",
     "//extensions/shell/common/api:api_registration",
     "//extensions/utility",
-    "//mojo/edk/system",
     "//skia",
     "//third_party/WebKit/public:blink",
     "//third_party/cld_2",
     "//ui/base",
     "//ui/base/ime",
     "//v8",
   ]
 
   sources = rebase_path(app_shell_gypi_values.app_shell_lib_sources,
                         ".",
@@ skipping 144 matching lines @@
     testonly = true
     sources = [
       "app/shell_main_mac.cc",
       "app/shell_main_mac.h",
     ]
     deps = [
       ":app_shell_lib",
     ]
   }
 }