Renamed MockEventListener in presentation and remoteplayback unit tests

Both PresentationReceiverTest and RemotePlaybackTest use a local test
class named MockEventListener. That is normally no big deal
but in jumbo builds they can be compiled in the same translation unit
and then the classes will collide. This patch gives the classes
unique prefixes so that no tests have to be excluded from jumbo.

Bug: 745732

Change-Id: Ic9a5e4e896b226d5ef7f99f2549cd3d4bb66fc42
Reviewed-on: https://chromium-review.googlesource.com/575141
Commit-Queue: Daniel Bratell <bratell@opera.com>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487479}
2 files changed