Make ToplevelWindowEventFilter and WorkspaceEventFilter into event handlers.

ash/wm/workspace/workspace_event_handler_test_helper.cc

Index: ash/wm/workspace/workspace_event_handler_test_helper.cc
===================================================================
--- ash/wm/workspace/workspace_event_handler_test_helper.cc	(revision 155914)
+++ ash/wm/workspace/workspace_event_handler_test_helper.cc	(working copy)
@@ -2,17 +2,17 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/wm/workspace/workspace_event_filter_test_helper.h"
+#include "ash/wm/workspace/workspace_event_handler_test_helper.h"
 
 namespace ash {
 namespace internal {
 
-WorkspaceEventFilterTestHelper::WorkspaceEventFilterTestHelper(
-    WorkspaceEventFilter* filter)
-    : filter_(filter) {
+WorkspaceEventHandlerTestHelper::WorkspaceEventHandlerTestHelper(
+    WorkspaceEventHandler* handler)
+    : handler_(handler) {
 }
 
-WorkspaceEventFilterTestHelper::~WorkspaceEventFilterTestHelper() {
+WorkspaceEventHandlerTestHelper::~WorkspaceEventHandlerTestHelper() {
 }
 
 }  // namespace internal