GitLab

The external protocol dialog class recorded metrics that fall under
the purview of the intent handling metrics class, so it has been
moved to be under that class structure.

BUG=1044710
TEST=ran IntentHandlingMetrics.* unit tests.

Change-Id: I156617bb999ca6072c744e117306b48287144c28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2024388Reviewed-by: David Jacobo <djacobo@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Alex Linker <ajlinker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736173}