Remove the hard_dep flag in GN.

tools/gn/secondary/chrome/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.
 
 import("//build/config/crypto.gni")
 import("//build/config/ui.gni")
 import("//tools/grit/grit_rule.gni")
 
 executable("chrome") {
   sources = [
@@ skipping 180 matching lines @@
   script = "//tools/licenses.py"
   outputs = [ about_credits_file ]
 
   # This script is impossible to write proper input dependencies for because it
   # basically greps the source tree for third_party directories. If a directory
   # is added or removed, it will change the result, but there is no way to
   # express this as a build dependency. We approximate this by depending on
   # the last change file to force an update whenever the code is updated.
   source_prereqs = [ "//build/util/LASTCHANGE" ]
 
-  hard_dep = true
-
   args = [ "credits", build_relative_about_credits_file ]
 }
 
 # Resources --------------------------------------------------------------------
 
 #group("chrome_resources") {
 #  deps = [
 #    ":browser_resources",
 #    ":common_resources",
 #    ":renderer_resources",
@@ skipping 83 matching lines @@
 #    ":theme_resources_gen",
 #    #"//ui:ui_resources",
 #  ]
 #}
 #
 ## TODO(brettw) rename "app_theme_resources" or something when we don't support
 ## GYP any more. This name is required to match the GYP build.
 #grit("theme_resources_gen") {
 #  source = "app/theme/theme_resources.grd"
 #}