Update Chrome globals to 63.0.3239.18.

Change-Id: Id4b5abfbdf7c9851ac317aa0bfcf8a0f7d50ee5c
diff --git a/dev/core/src/com/google/gwt/dev/js/globals/chrome.txt b/dev/core/src/com/google/gwt/dev/js/globals/chrome.txt
index 95aefdf..17b596f 100644
--- a/dev/core/src/com/google/gwt/dev/js/globals/chrome.txt
+++ b/dev/core/src/com/google/gwt/dev/js/globals/chrome.txt
@@ -309,6 +309,7 @@
 OfflineAudioContext
 Option
 OscillatorNode
+OverconstrainedError
 OverflowEvent
 PageTransitionEvent
 PasswordCredential
@@ -704,6 +705,7 @@
 navigator
 offscreenBuffering
 onabort
+onafterprint
 onanimationend
 onanimationiteration
 onanimationstart
@@ -712,6 +714,7 @@
 onautocompleteerror
 onauxclick
 onbeforeinstallprompt
+onbeforeprint
 onbeforeunload
 onblur
 oncancel