GitLab

This removes the code that resolves the webstore URL which doesn't seem
too work any more. Instead it just navigates to the webstore page and
uses WebstoreInstallWithPrompt to install the app.

BUG=341353

Review URL: https://codereview.chromium.org/412043003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285876 0039d316-1c4b-4281-b951-d872f2087c98