Revert r333104: "Added UMA statistics for changing the active window via click or touch events."
This caused leaks in the ChromeOS valgrind bot: http://build.chromium.org/p/chromium.memory.fyi/builders/Chromium%20OS%20%28valgrind%29%283%29/builds/37831/steps/memory%20test%3A%20ash_unittests/logs/stdio
Leak_DefinitelyLost
712 (136 direct, 576 indirect) bytes in 1 blocks are definitely lost in loss record 3,508 of 4,428
operator new(unsigned long) (m_replacemalloc/vg_replace_malloc.c:1140)
ash::(anonymous namespace)::DesktopTaskSwitchMetricRecorderTest::CreateNonPositionableWindow() const (ash/metrics/desktop_task_switch_metric_recorder_unittest.cc:113)
ash::(anonymous namespace)::DesktopTaskSwitchMetricRecorderTest_ActivateNonPositionableWindowBetweenTwoPositionableWindowActivations_Test::TestBody() (ash/metrics/desktop_task_switch_metric_recorder_unittest.cc:189)
BUG=489813, 489814
TBR=bruthig@chromium.org
Review URL: https://codereview.chromium.org/
1165003010
Cr-Commit-Position: refs/heads/master@{#333185}