content: Fix for GN Mac build.

content/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("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/manifest.gni")
 import("//tools/grit/repack.gni")
 import("//tools/grit/grit_rule.gni")
@@ skipping 466 matching lines @@
   # TODO(GYP) this should be a bundle. Lots of other stuff in this target.
   # GYP version: content/content_shell.gypi:content_shell_framework
   shared_library("framework") {
     testonly = true
 
     # TODO(GYP) bug 546894: Fix GN and toolchains to handle spaces here.
     #output_name = "$content_shell_product_name Framework"
     output_name = "content_shell_framework"  # Temporary one with no spaces.
 
     sources = [
-      "shell_content_main.cc",
-      "shell_content_main.h",
+      "app/shell_content_main.cc",
+      "app/shell_content_main.h",
     ]
 
     deps = [
       ":content_shell_lib",
     ]
   }
 }