Update partially-missing comment.

Change-Id: I82111e2602c8d0b6488c1aca2440edafca9cfddc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949832
Commit-Queue: Glen Robertson <glenrob@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Auto-Submit: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721384}

chrome/browser/web_applications/web_app_install_task.h

@@ -180,7 +180,9 @@ class WebAppInstallTask : content::WebContentsObserver {
       bool is_installable);
 
   // Either dispatches an asynchronous check for whether this installation
-  // should be stopped and
+  // should be stopped and an intent to the Play Store should be made, or
+  // synchronously calls OnDidCheckForIntentToPlayStore() implicitly failing the
+  // check if it cannot be made.
   void CheckForPlayStoreIntentOrGetIcons(
       const blink::Manifest& manifest,
       std::unique_ptr<WebApplicationInfo> web_app_info,