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WebLayer's logic for launching external intents currently resides in a
static Java method that is called directly by C++. However, we are in
the course of changing WebLayer to share //chrome's
ExternalNavigationHandler.java, which will need to be a member of
TabImpl.java. To prepare for that change, this CL changes the C++->Java
hookup to go via TabImpl.

This CL has no behavioral changes. I tested manually that basic intent
launching still works in weblayer shell.

Bug: 1031465
Change-Id: Iaa8a16838226b70ec865316543fe51d81f95bca4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2100850
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749762}