Move DefaultActivationClient to wm/core

ui/wm/test/wm_test_helper.cc

Index: ui/wm/test/wm_test_helper.cc
diff --git a/ui/wm/test/wm_test_helper.cc b/ui/wm/test/wm_test_helper.cc
index 160923c8f36bcf4298d8d12c7e97da2ca4c0410f..0384466ac75406bd5afe180a5a346049a902865f 100644
--- a/ui/wm/test/wm_test_helper.cc
+++ b/ui/wm/test/wm_test_helper.cc
@@ -4,12 +4,12 @@
 
 #include "ui/wm/test/wm_test_helper.h"
 
-#include "ui/aura/client/default_activation_client.h"
 #include "ui/aura/client/default_capture_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/test/test_focus_client.h"
 #include "ui/aura/window.h"
 #include "ui/wm/core/compound_event_filter.h"
+#include "ui/wm/core/default_activation_client.h"
 #include "ui/wm/core/input_method_event_filter.h"
 
 namespace wm {
@@ -32,8 +32,7 @@ WMTestHelper::WMTestHelper(const gfx::Size& default_window_size) {
   input_method_filter_->SetInputMethodPropertyInRootWindow(host_->window());
   root_window_event_filter_->AddHandler(input_method_filter_.get());
 
-  activation_client_.reset(
-      new aura::client::DefaultActivationClient(host_->window()));
+  new wm::DefaultActivationClient(host_->window());
 
   capture_client_.reset(
       new aura::client::DefaultCaptureClient(host_->window()));