Fixes _NET_ACTIVE_WINDOW support check in order to not always return no.

ui/views/widget/desktop_aura/desktop_screen_x11_unittest.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/widget/desktop_aura/desktop_screen_x11.h"
 
 #include "base/message_loop/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/display_observer.h"
 #include "ui/views/test/views_test_base.h"
 #include "ui/views/widget/desktop_aura/desktop_native_widget_aura.h"
 #include "ui/views/widget/desktop_aura/desktop_root_window_host_x11.h"
+#include "ui/views/widget/desktop_aura/x11_desktop_handler.h"
 
 namespace views {
 
 const int64 kFirstDisplay = 5321829;
 const int64 kSecondDisplay = 928310;
 
 class DesktopScreenX11Test : public views::ViewsTestBase,
                              public gfx::DisplayObserver {
  public:
   DesktopScreenX11Test() {}
   virtual ~DesktopScreenX11Test() {}
 
   // Overridden from testing::Test:
   virtual void SetUp() OVERRIDE {
     ViewsTestBase::SetUp();
     // Initialize the world to the single monitor case.
     std::vector<gfx::Display> displays;
     displays.push_back(gfx::Display(kFirstDisplay, gfx::Rect(0, 0, 640, 480)));
     screen_.reset(new DesktopScreenX11(displays));
     screen_->AddObserver(this);
+
+    // We want to have a synchronous activation behavior.
+    X11DesktopHandler::get()->SetWMSupportsActiveWindowForTests(false);
   }
 
   virtual void TearDown() OVERRIDE {
     screen_.reset();
     ViewsTestBase::TearDown();
   }
 
  protected:
   std::vector<gfx::Display> changed_display_;
   std::vector<gfx::Display> added_display_;
@@ skipping 204 matching lines @@
       screen()->GetDisplayNearestWindow(window_one->GetNativeWindow()).id());
   EXPECT_EQ(
       kSecondDisplay,
       screen()->GetDisplayNearestWindow(window_two->GetNativeWindow()).id());
 
   window_one->CloseNow();
   window_two->CloseNow();
 }
 
 }  // namespace views