Add structural support for building chrome_browser_ui.gypi on iOS

This is not yet used, but helps lay the groundwork for building chrome/
targets for iOS.

This uses exclude-all-and-include since Chrome for iOS uses only a very
small portion of chrome/browser/ui/, so the include list will be much more
manageable and maintainable than an exclude list.

BUG=156699


Review URL: https://chromiumcodereview.appspot.com/11339010

git-svn-id: http://src.chromium.org/svn/trunk/src/build@164908 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -959,6 +959,7 @@
       ['OS=="ios"', {
         'disable_nacl%': 1,
         'enable_gpu%': 0,
+        'enable_task_manager%': 0,
         'icu_use_data_file_flag%': 1,
         'use_system_bzip2%': 1,
         'use_system_libxml%': 1,
@@ -1202,7 +1203,7 @@
         ],
       }],
 
-      ['os_posix==1 and chromeos==0 and OS!="android"', {
+      ['os_posix==1 and chromeos==0 and OS!="android" and OS!="ios"', {
         'use_cups%': 1,
       }, {
         'use_cups%': 0,