Use CustomTabActivityTabController to loadUrl in Tab instead of casting ChromeActivity to CustomTabActivity.

Bug: 904826
Change-Id: I7edb6bec4cbfabfbba43e9e27a453c579410e98a
Reviewed-on: https://chromium-review.googlesource.com/c/1422379
Reviewed-by: Pavel Shmakov <pshmakov@chromium.org>
Reviewed-by: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
Commit-Queue: Anna Malova <amalova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624770}
2 files changed