Mojo C++ bindings: make the generator use STL/WTF string/vector/map by default.

mojo/mojo_public_tests.gyp

Index: mojo/mojo_public_tests.gyp
diff --git a/mojo/mojo_public_tests.gyp b/mojo/mojo_public_tests.gyp
index c1146675dc312319277690ffd479442aa09c1fde..ebe2b6c788f5120b696d174d6b2118ab9e9a5d21 100644
--- a/mojo/mojo_public_tests.gyp
+++ b/mojo/mojo_public_tests.gyp
@@ -43,7 +43,6 @@
           'public/cpp/bindings/tests/rect_chromium.typemap',
           'public/cpp/bindings/tests/test_native_types_chromium.typemap',
         ],
-        'use_new_wrapper_types': 'true',
       },
       'includes': [ 'mojom_bindings_generator_explicit.gypi' ],
     },
@@ -54,7 +53,6 @@
         'mojom_typemaps': [
           'public/cpp/bindings/tests/struct_with_traits.typemap',
         ],
-        'use_new_wrapper_types': 'true',
       },
       'sources': [
         'public/interfaces/bindings/tests/struct_with_traits.mojom',
@@ -89,7 +87,6 @@
           'public/interfaces/bindings/tests/test_associated_interfaces.mojom',
           'public/interfaces/bindings/tests/validation_test_associated_interfaces.mojom',
         ],
-        'use_new_wrapper_types': 'true',
       },
       'includes': [ 'mojom_bindings_generator_explicit.gypi' ],
     },
@@ -111,9 +108,6 @@
       'sources': [
         'public/interfaces/bindings/tests/test_wtf_types.mojom',
       ],
-      'variables': {
-        'use_new_wrapper_types': 'true',
-      },
       'includes': [ 'mojom_bindings_generator.gypi' ],
     },
   ],
@@ -130,7 +124,6 @@
               'public/cpp/bindings/tests/test_native_types_blink.typemap',
             ],
             'mojom_files': '<(mojo_public_test_interfaces_mojom_files)',
-            'use_new_wrapper_types': 'true',
           },
           'includes': [ 'mojom_bindings_generator_explicit.gypi' ],
         },
@@ -156,7 +149,6 @@
           'type': 'static_library',
           'variables': {
             'for_blink': 'true',
-            'use_new_wrapper_types': 'true',
           },
           'sources': [
             'public/interfaces/bindings/tests/test_wtf_types.mojom',