Revert of Fixes redirects to external apps when navigating from PWA. (patchset #9 id:280001 of https://codereview.chromium.org/2969143002/ )

Reason for revert:
Test failures from new test WebappNavigationTest#testNewTabLinkToExternalApp on hromium.android/Marshmallow 64 bit Tester.

BUG=741568

Original issue's description:
> Fixes the redirect to external apps when navigating from PWA.
>
> This is done with avoiding explicit chrome package name (using
> component name instead) and using
> EXTRA_SEND_TO_EXTERNAL_DEFAULT_HANDLER on the intent.
>
> With this patch the redirect works, however it takes a long time for CCT to
> consult ExternalNavigationHandler. This results in suboptimal UX. Same redirect
> in ChromeTabbedActivity is almost instantaneous. Result is that
> for _blank links CCT shows up briefly before redirecting to an external app.
> In a follow up it should be investigated why it is the case and if it cannot
> be improved, we might need to bypass CCT in such case, which would diverge
> from existing navigation paths for _blank links in Clank.
>
> BUG=740402
>
> Review-Url: https://codereview.chromium.org/2969143002
> Cr-Commit-Position: refs/heads/master@{#485831}
> Committed: https://chromium.googlesource.com/chromium/src/+/727468b41b2fe48bf73983ab0c3aa2632b47d89e

TBR=dominickn@chromium.org,yusufo@chromium.org,tedchoc@chromium.org,piotrs@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=740402

Review-Url: https://codereview.chromium.org/2975883003
Cr-Commit-Position: refs/heads/master@{#485910}
7 files changed