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Currently if we open the link in a new tab (e.g. ctrl + click, context
menu, from another app), the intent picker icon will not show up even
there are apps that can handle that URL. This is because:
1. We check the browser for the web contents in navigation throttle
before the adding the web contents to tab strip model for new tab case.
2. When open new tab from new-tab page, the starting URL is empty.
This CL fixes this issue by moving these checks to only check for
automatically pop up the bubble or automatically launch the app, but
still show the icon if there are app found.

BUG=1141049, b/171260488

Change-Id: Idcf4b07c34304bf6664f874142128ceddb6d6569
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500974Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821656}