GitLab

Fixed the following bug:
If an ephemeral app is cached, attempting to install via the app's
webstore detail page will fail. An error dialog will be displayed,
stating that the install is already in progress.

BUG=312460

Review URL: https://codereview.chromium.org/93943006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243234 0039d316-1c4b-4281-b951-d872f2087c98