Merge pull request #363 from electron/v8-promise-internal

Turn on v8_promise_internal_field_count=1

chromiumcontent/args/shared_library.gn

@@ -9,3 +9,4 @@ enable_widevine = true
 proprietary_codecs = true
 is_component_ffmpeg = true
 ffmpeg_branding = "Chrome"
+v8_promise_internal_field_count = 1  # https://github.com/nodejs/node/pull/13242

chromiumcontent/args/static_library.gn

@@ -8,3 +8,4 @@ enable_widevine = true
 proprietary_codecs = true
 is_component_ffmpeg = true
 ffmpeg_branding = "Chrome"
+v8_promise_internal_field_count = 1  # https://github.com/nodejs/node/pull/13242