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

ash/metrics/user_metrics_recorder.cc

Index: ash/metrics/user_metrics_recorder.cc
diff --git a/ash/metrics/user_metrics_recorder.cc b/ash/metrics/user_metrics_recorder.cc
index 8229039ea3e29e54e364fd0f4d36a715d7ee82de..cfc4d8ee16d4a79a28fe463ce86ff38e8f60b497 100644
--- a/ash/metrics/user_metrics_recorder.cc
+++ b/ash/metrics/user_metrics_recorder.cc
@@ -4,7 +4,6 @@
 
 #include "ash/metrics/user_metrics_recorder.h"
 
-#include "ash/metrics/desktop_task_switch_metric_recorder.h"
 #include "ash/session/session_state_delegate.h"
 #include "ash/shelf/shelf_delegate.h"
 #include "ash/shelf/shelf_item_types.h"
@@ -237,11 +236,6 @@ void UserMetricsRecorder::RecordUserMetricsAction(UserMetricsAction action) {
     case ash::UMA_CLOSE_THROUGH_CONTEXT_MENU:
       base::RecordAction(base::UserMetricsAction("CloseFromContextMenu"));
       break;
-    case ash::UMA_DESKTOP_SWITCH_TASK:
-      base::RecordAction(base::UserMetricsAction("Desktop_SwitchTask"));
-      task_switch_metrics_recorder_.OnTaskSwitch(
-          TaskSwitchMetricsRecorder::kDesktop);
-      break;
     case ash::UMA_DRAG_MAXIMIZE_LEFT:
       base::RecordAction(base::UserMetricsAction("WindowDrag_MaximizeLeft"));
       break;
@@ -604,19 +598,6 @@ void UserMetricsRecorder::RecordUserMetricsAction(UserMetricsAction action) {
   }
 }
 
-void UserMetricsRecorder::OnShellInitialized() {
-  // Lazy creation of the DesktopTaskSwitchMetricRecorder because it accesses
-  // Shell::GetInstance() which is not available when |this| is instantiated.
-  if (!desktop_task_switch_metric_recorder_) {
-    desktop_task_switch_metric_recorder_.reset(
-        new DesktopTaskSwitchMetricRecorder());
-  }
-}
-
-void UserMetricsRecorder::OnShellShuttingDown() {
-  desktop_task_switch_metric_recorder_.reset();
-}
-
 void UserMetricsRecorder::RecordPeriodicMetrics() {
   ShelfLayoutManager* manager =
       ShelfLayoutManager::ForShelf(Shell::GetPrimaryRootWindow());