Add GCAPI to the GN build.

chrome/chrome_installer.gypi

Index: chrome/chrome_installer.gypi
diff --git a/chrome/chrome_installer.gypi b/chrome/chrome_installer.gypi
index f448ad22eb467b9024fa547c775a7c9e03edab5b..b7b6a3c68071d420f95cdf005bc1e33167a8284f 100644
--- a/chrome/chrome_installer.gypi
+++ b/chrome/chrome_installer.gypi
@@ -12,6 +12,7 @@
     ['OS=="win"', {
       'targets': [
         {
+          # GN version: //chrome/installer/gcapi
           'target_name': 'gcapi_dll',
           'type': 'loadable_module',
           'dependencies': [
@@ -26,6 +27,7 @@
           ],
         },
         {
+          # GN version: //chrome/installer/gcapi:lib
           'target_name': 'gcapi_lib',
           'type': 'static_library',
           'dependencies': [
@@ -46,10 +48,9 @@
             'installer/gcapi/gcapi_reactivation.cc',
             'installer/gcapi/gcapi_reactivation.h',
           ],
-          # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-          'msvs_disabled_warnings': [ 4267, ],
         },
         {
+          # GN version: //chrome/installer/gcapi:gcapi_test
           'target_name': 'gcapi_test',
           'type': 'executable',
           'dependencies': [