Make mojo_system static and mojo_system_impl a component, never use both

mojo/mojo.gyp

Index: mojo/mojo.gyp
diff --git a/mojo/mojo.gyp b/mojo/mojo.gyp
index c721cfaab6c04ae1c77d47ef0ac5965f7e21d041..7d4b356e368bda238f7825ab88af6d189494bdf4 100644
--- a/mojo/mojo.gyp
+++ b/mojo/mojo.gyp
@@ -36,6 +36,7 @@
         'mojo_js',
         'mojo_js_unittests',
         'mojo_message_generator',
+        'mojo_native_viewport_service',
         'mojo_pepper_container_app',
         'mojo_public_test_utils',
         'mojo_public_bindings_unittests',
@@ -70,7 +71,6 @@
         '../base/base.gyp:base',
         '../base/base.gyp:test_support_base',
         '../testing/gtest.gyp:gtest',
-        'mojo_system',
         'mojo_system_impl',
         'mojo_test_support',
         'mojo_test_support_impl',
@@ -84,7 +84,6 @@
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:test_support_base',
-        'mojo_system',
         'mojo_system_impl',
         'mojo_test_support',
         'mojo_test_support_impl',
@@ -97,12 +96,12 @@
       'target_name': 'mojo_system_impl',
       'type': '<(component)',
       'dependencies': [
-        'mojo_system',
         '../base/base.gyp:base',
         '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
       ],
       'defines': [
         'MOJO_SYSTEM_IMPL_IMPLEMENTATION',
+        'MOJO_SYSTEM_IMPLEMENTATION',
       ],
       'sources': [
         'embedder/embedder.cc',
@@ -119,8 +118,8 @@
         'system/channel.cc',
         'system/channel.h',
         'system/constants.h',
-        'system/core_impl.cc',
-        'system/core_impl.h',
+        'system/core.cc',
+        'system/core.h',
         'system/data_pipe.cc',
         'system/data_pipe.h',
         'system/data_pipe_consumer_dispatcher.cc',
@@ -183,12 +182,11 @@
         '../testing/gtest.gyp:gtest',
         'mojo_common_test_support',
         'mojo_system',
-        'mojo_system_impl',
       ],
       'sources': [
         'embedder/embedder_unittest.cc',
         'embedder/platform_channel_pair_posix_unittest.cc',
-        'system/core_impl_unittest.cc',
+        'system/core_unittest.cc',
         'system/core_test_base.cc',
         'system/core_test_base.h',
         'system/data_pipe_unittest.cc',
@@ -257,7 +255,6 @@
       'dependencies': [
         '../base/base.gyp:base',
         '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
-        'mojo_system',
       ],
       'sources': [
         'common/common_type_converters.cc',
@@ -280,7 +277,6 @@
         '../base/base.gyp:base',
         '../base/base.gyp:test_support_base',
         '../testing/gtest.gyp:gtest',
-        'mojo_system',
         'mojo_system_impl',
       ],
       'sources': [
@@ -304,7 +300,6 @@
         'mojo_common_test_support',
         'mojo_public_test_utils',
         'mojo_run_all_unittests',
-        'mojo_system',
         'mojo_system_impl',
       ],
       'sources': [
@@ -405,7 +400,6 @@
         'mojo_gles2_impl',
         'mojo_service_manager',
         'mojo_shell_bindings',
-        'mojo_system',
         'mojo_system_impl',
         'mojo_native_viewport_service',
         'mojo_spy',
@@ -466,7 +460,6 @@
         'mojo_environment_chromium',
         'mojo_service_manager',
         'mojo_shell_lib',
-        'mojo_system',
         'mojo_system_impl',
       ],
       'sources': [
@@ -486,7 +479,6 @@
         'mojo_run_all_unittests',
         'mojo_service_manager',
         'mojo_shell_client',
-        'mojo_system',
       ],
       'variables': {
         'mojom_base_output_dir': 'mojo',
@@ -505,13 +497,11 @@
         '../gin/gin.gyp:gin',
         '../v8/tools/gyp/v8.gyp:v8',
         'mojo_common_lib',
-        'mojo_system',
       ],
       'export_dependent_settings': [
         '../base/base.gyp:base',
         '../gin/gin.gyp:gin',
         'mojo_common_lib',
-        'mojo_system',
       ],
       'sources': [
         'bindings/js/core.cc',
@@ -546,7 +536,6 @@
         'mojo_bindings',
         'mojo_common_lib',
         'mojo_environment_chromium',
-        'mojo_system',
         'mojo_system_impl',
       ],
       'sources': [