Revert of Move DefaultActivationClient to wm/core

content/browser/renderer_host/render_widget_host_view_aura_unittest.cc

Index: content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc b/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
index 591c725fcee8b8dba53167f8b400e9f34fe58bd4..98606659f48ac48db273ff7d357721b6a1154894 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
@@ -47,7 +47,6 @@
 #include "ui/compositor/test/in_process_context_factory.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
-#include "ui/wm/core/default_activation_client.h"
 
 using testing::_;
 
@@ -208,7 +207,6 @@
         scoped_ptr<ui::ContextFactory>(new ui::InProcessContextFactory));
     aura_test_helper_.reset(new aura::test::AuraTestHelper(&message_loop_));
     aura_test_helper_->SetUp();
-    new wm::DefaultActivationClient(aura_test_helper_->root_window());
 
     browser_context_.reset(new TestBrowserContext);
     process_host_ = new MockRenderProcessHost(browser_context_.get());