Mojo: Remove InterfaceProvider.

mojo/mojo_public.gypi

 {
   'targets': [
     {
       'target_name': 'mojo_system',
       'type': 'static_library',
       'defines': [
         'MOJO_SYSTEM_IMPLEMENTATION',
       ],
       'include_dirs': [
         '..',
@@ skipping 362 matching lines @@
             'public/cpp/utility/lib/mutex.cc',
             'public/cpp/utility/lib/thread.cc',
           ],
         }],
       ],
       'include_dirs': [
         '..',
       ],
     },
     {
-      # GN version: //mojo/public/interfaces/interface_provider:interface_provider
-      'target_name': 'mojo_interface_provider_bindings',
-      'type': 'static_library',
-      'sources': [
-        'public/interfaces/interface_provider/interface_provider.mojom',
-      ],
-      'includes': [ 'public/tools/bindings/mojom_bindings_generator.gypi' ],
-      'dependencies': [
-        'mojo_cpp_bindings',
-      ],
-      'export_dependent_settings': [
-        'mojo_cpp_bindings',
-      ],
-    },
-    {
       # GN version: //mojo/public/interfaces/service_provider:service_provider
       'target_name': 'mojo_service_provider_bindings',
       'type': 'static_library',
       'sources': [
         'public/interfaces/service_provider/service_provider.mojom',
       ],
       'includes': [ 'public/tools/bindings/mojom_bindings_generator.gypi' ],
       'dependencies': [
         'mojo_cpp_bindings',
       ],
@@ skipping 42 matching lines @@
           },
           'dependencies': [
             'mojo_public_java',
           ],
           'includes': [ '../build/java.gypi' ],
         },
       ],
     }],
   ],
 }