Introduces chromium_resources.gyp to factor out Chrome resource generation

ui/aura_shell/aura_shell.gyp

Index: ui/aura_shell/aura_shell.gyp
diff --git a/ui/aura_shell/aura_shell.gyp b/ui/aura_shell/aura_shell.gyp
index 35d2efd72387e6bd54e383de6cf7b048385c887b..e46f28d4a033e7dfda4bbdd803045d9c9b0fbf98 100644
--- a/ui/aura_shell/aura_shell.gyp
+++ b/ui/aura_shell/aura_shell.gyp
@@ -85,6 +85,7 @@
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:test_support_base',
+        '../../chrome/chrome_resources.gyp:packed_resources',
         '../../build/temp_gyp/googleurl.gyp:googleurl',
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
@@ -115,13 +116,6 @@
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources/ui_resources.rc',
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources_standard/ui_resources_standard.rc',
       ],
-      'conditions': [
-        ['OS!="mac"', {
-          'dependencies': [
-            '../../chrome/chrome.gyp:packed_resources',
-           ],
-        }],
-      ],
     },
     {
       'target_name': 'aura_shell_exe',
@@ -129,6 +123,7 @@
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_i18n',
+        '../../chrome/chrome_resources.gyp:packed_resources',
         '../../skia/skia.gyp:skia',
         '../../third_party/icu/icu.gyp:icui18n',
         '../../third_party/icu/icu.gyp:icuuc',
@@ -156,13 +151,6 @@
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources/ui_resources.rc',
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources_standard/ui_resources_standard.rc',
       ],
-      'conditions': [
-        ['OS!="mac"', {
-          'dependencies': [
-            '../../chrome/chrome.gyp:packed_resources',
-           ],
-        }],
-      ],
     },
     # It's convenient for aura_shell developers to be able to build all
     # compositor and aura targets from within this solution.