Revert of Move DefaultActivationClient to wm/core

chrome/test/base/browser_with_test_window_test.cc

Index: chrome/test/base/browser_with_test_window_test.cc
diff --git a/chrome/test/base/browser_with_test_window_test.cc b/chrome/test/base/browser_with_test_window_test.cc
index e5de4b2a3bcc818c41b4fabd0ba1916b329ee7b0..c45f7fa7090bc1e18c4bd2ceb398123dc0a97f6e 100644
--- a/chrome/test/base/browser_with_test_window_test.cc
+++ b/chrome/test/base/browser_with_test_window_test.cc
@@ -20,7 +20,6 @@
 #if defined(USE_AURA)
 #include "ui/aura/test/aura_test_helper.h"
 #include "ui/compositor/test/context_factories_for_test.h"
-#include "ui/wm/core/default_activation_client.h"
 #endif
 
 #if defined(USE_ASH)
@@ -71,7 +70,6 @@
   aura_test_helper_.reset(new aura::test::AuraTestHelper(
       base::MessageLoopForUI::current()));
   aura_test_helper_->SetUp();
-  new wm::DefaultActivationClient(aura_test_helper_->root_window());
 #endif  // USE_AURA
 #if defined(TOOLKIT_VIEWS)
   views_delegate_.reset(CreateViewsDelegate());