linux_aura: Reenable a bunch of tests that were disabled.

chrome/browser/ui/panels/base_panel_browser_test.cc

Index: chrome/browser/ui/panels/base_panel_browser_test.cc
diff --git a/chrome/browser/ui/panels/base_panel_browser_test.cc b/chrome/browser/ui/panels/base_panel_browser_test.cc
index 3288400027098436fd32f44c03d259ee5bd3c0c8..574534dd8a2ba617728d4375ba64b9abd26d4cc2 100644
--- a/chrome/browser/ui/panels/base_panel_browser_test.cc
+++ b/chrome/browser/ui/panels/base_panel_browser_test.cc
@@ -38,10 +38,6 @@
 #include "ui/base/x/x11_util.h"
 #endif
 
-#if defined(OS_LINUX) && !defined(USE_AURA)
-#include "ui/base/x/active_window_watcher_x.h"
-#endif
-
 #if defined(OS_MACOSX)
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "chrome/browser/ui/cocoa/run_loop_testing.h"
@@ -622,9 +618,5 @@ std::string BasePanelBrowserTest::MakePanelName(int index) {
 }
 
 bool BasePanelBrowserTest::WmSupportWindowActivation() {
-#if defined(OS_LINUX) && !defined(USE_AURA)
-  return ui::ActiveWindowWatcherX::WMSupportsActivation();
-#else
   return true;
-#endif
 }