Chrome should never attempt to launch in Metro if it is no longer default browser

chrome/browser/process_singleton_win.cc

Index: chrome/browser/process_singleton_win.cc
diff --git a/chrome/browser/process_singleton_win.cc b/chrome/browser/process_singleton_win.cc
index 707ccfc91a7a30c2b1c9093a012e2349c9d2f0bb..d7e3609dc6cb5c640a4c35c9d410da7a98c23625 100644
--- a/chrome/browser/process_singleton_win.cc
+++ b/chrome/browser/process_singleton_win.cc
@@ -22,6 +22,7 @@
 #include "base/win/win_util.h"
 #include "base/win/windows_version.h"
 #include "base/win/wrapped_window_proc.h"
+#include "chrome/browser/shell_integration.h"
 #include "chrome/browser/ui/simple_message_box.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
@@ -172,9 +173,10 @@ bool ActivateMetroChrome() {
 // Following conditions apply:-
 // 1. Windows 8 or greater.
 // 2. Not in Windows 8 immersive mode.
-// 3. Process integrity level is not high.
-// 4. The profile data directory is the default directory .
-// 5. Last used mode was immersive/machine is a tablet.
+// 3. Chrome is default browser.
+// 4. Process integrity level is not high.
+// 5. The profile data directory is the default directory.
+// 6. Last used mode was immersive/machine is a tablet.
 // TODO(ananta)
 // Move this function to a common place as the Windows 8 delegate_execute
 // handler can possibly use this.
@@ -189,6 +191,9 @@ bool ShouldLaunchInWindows8ImmersiveMode(const FilePath& user_data_dir) {
   if (base::win::IsProcessImmersive(base::GetCurrentProcessHandle()))
     return false;
 
+  if (!ShellIntegration::IsDefaultBrowser())
+    return false;
+
   base::IntegrityLevel integrity_level = base::INTEGRITY_UNKNOWN;
   base::GetProcessIntegrityLevel(base::GetCurrentProcessHandle(),
                                  &integrity_level);
@@ -258,7 +263,6 @@ bool ProcessSingleton::EscapeVirtualization(const FilePath& user_data_dir) {
 ProcessSingleton::ProcessSingleton(const FilePath& user_data_dir)
     : window_(NULL), locked_(false), foreground_window_(NULL),
     is_virtualized_(false), lock_file_(INVALID_HANDLE_VALUE) {
-  FilePath default_user_data_dir;
   // For Windows 8 and above check if we need to relaunch into Windows 8
   // immersive mode.
   if (ShouldLaunchInWindows8ImmersiveMode(user_data_dir)) {