Fix a crash which occurs due to a CHECK firing in the HWNDMessageHandler::OnKeyEvent code path on W…

ui/events/win/events_win.cc

Index: ui/events/win/events_win.cc
diff --git a/ui/events/win/events_win.cc b/ui/events/win/events_win.cc
index ccdb2be7e7bb3ab8a5c3c7688d0ec9640c4639dc..98f4775826eb1bfc57d9b56e0cecfdf58248cc6b 100644
--- a/ui/events/win/events_win.cc
+++ b/ui/events/win/events_win.cc
@@ -156,6 +156,10 @@ EventType EventTypeFromNative(const base::NativeEvent& native_event) {
     // sequences.
     case WM_DEADCHAR:
     case WM_KEYUP:
+    // The WM_SYSDEADCHAR message is posted to a window with keyboard focus
+    // when the WM_SYSKEYDOWN message is translated by the TranslateMessage
+    // function. It specifies the character code of the system dead key.
+    case WM_SYSDEADCHAR:
     case WM_SYSKEYUP:
       return ET_KEY_RELEASED;
     case WM_LBUTTONDBLCLK: