Enable Mojo on iOS.

mojo/mojo_public.gypi

 {
   'targets': [
     {
       'target_name': 'mojo_system',
       'type': 'static_library',
       'defines': [
         'MOJO_SYSTEM_IMPLEMENTATION',
       ],
       'include_dirs': [
         '..',
@@ skipping 53 matching lines @@
         ['OS=="mac"', {
           'xcode_settings': {
             # Make it a run-path dependent library.
             'DYLIB_INSTALL_NAME_BASE': '@loader_path',
           },
         }],
       ],
     },
     {
       'target_name': 'mojo_test_support',
-      'type': 'shared_library',
+      # Changed this from a shared library to a static library as it wasn't
+      # found on iOS when it was a shared library.
+      'type': 'static_library',
       'defines': [
         'MOJO_TEST_SUPPORT_IMPLEMENTATION',
       ],
       'include_dirs': [
         '..',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '..',
         ],
@@ skipping 292 matching lines @@
           'type': 'none',
           'variables': {
             'java_in_dir': 'public/java',
           },
           'includes': [ '../build/java.gypi' ],
         },
       ],
     }],
   ],
 }