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We have num_of_active_touches_for_test in both TouchActionFilter and
InputRouterImpl class which are used in InputRouterImplTest only. This
CL makes InputRouterImplTest a friend class to TouchActionFilter so that
we can just access its private member.

This CL is a code cleanup, there is no behavior change introduced.

Bug: None
Change-Id: I768a5e293f5c16d1f1d39af7e2abf161f35e669d
Reviewed-on: https://chromium-review.googlesource.com/1246274Reviewed-by: Sahel Sharify <sahel@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595167}