ExtensionInputMethodEventRouter: DCHECK -> early exit

Bug: 752315
Change-Id: Iaee8b7f66471482f08dc3c310523e6fb88bb7a50
Reviewed-on: https://chromium-review.googlesource.com/c/1260015
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597254}

chrome/browser/chromeos/extensions/input_method_event_router.cc

@@ -35,11 +35,12 @@ void ExtensionInputMethodEventRouter::InputMethodChanged(
     input_method::InputMethodManager* manager,
     Profile* profile,
     bool show_message) {
-  // This should probably be CHECK, as delivering event to a wrong
-  // profile means delivering it to a wrong extension instance.
-  DCHECK(profile->IsSameProfile(Profile::FromBrowserContext(context_)));
-  extensions::EventRouter* router = extensions::EventRouter::Get(context_);
+  // If an event is recieved from a different profile, e.g. while switching
+  // between multiple profiles, ignore it.
+  if (!profile->IsSameProfile(Profile::FromBrowserContext(context_)))
+    return;
 
+  extensions::EventRouter* router = extensions::EventRouter::Get(context_);
   if (!router->HasEventListener(OnChanged::kEventName))
     return;