Revert r333104: "Added UMA statistics for changing the active window via click or touch events."

ash/metrics/task_switch_metrics_recorder_unittest.cc

Index: ash/metrics/task_switch_metrics_recorder_unittest.cc
diff --git a/ash/metrics/task_switch_metrics_recorder_unittest.cc b/ash/metrics/task_switch_metrics_recorder_unittest.cc
index 0b3d03ad414d4b59210713eaeb77c8d661b38e17..90a0db1fe07d08d86bc45db92d135d167d433e16 100644
--- a/ash/metrics/task_switch_metrics_recorder_unittest.cc
+++ b/ash/metrics/task_switch_metrics_recorder_unittest.cc
@@ -62,20 +62,6 @@ void TaskSwitchMetricsRecorderTest::TearDown() {
 
 }  // namespace
 
-// Verifies that the TaskSwitchMetricsRecorder::kDesktop source adds data to the
-// Ash.Desktop.TimeBetweenNavigateToTaskSwitches histogram.
-TEST_F(TaskSwitchMetricsRecorderTest, VerifyTaskSwitchesForDesktopAreRecorded) {
-  const std::string kHistogramName =
-      "Ash.Desktop.TimeBetweenNavigateToTaskSwitches";
-
-  OnTaskSwitch(TaskSwitchMetricsRecorder::kDesktop);
-  OnTaskSwitch(TaskSwitchMetricsRecorder::kDesktop);
-  histogram_tester_->ExpectTotalCount(kHistogramName, 1);
-
-  OnTaskSwitch(TaskSwitchMetricsRecorder::kDesktop);
-  histogram_tester_->ExpectTotalCount(kHistogramName, 2);
-}
-
 // Verifies that the TaskSwitchMetricsRecorder::kWindowCycleController source
 // adds data to the Ash.WindowCycleController.TimeBetweenTaskSwitches histogram.
 TEST_F(TaskSwitchMetricsRecorderTest,