Revert r46023: "Detect new instance of the browser when running in the background in persistent"

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index 91614b647c3f39e99c191e8c5f91a16b5e0bf567..e6f6eb3e256f85825b79833c06438ba9dc1dbb61 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -139,7 +139,8 @@ class BrowserProcess {
   // disk.
   virtual void CheckForInspectorFiles() = 0;
 
-#if (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)
+#if defined(OS_WIN)
+
   // This will start a timer that, if Chrome is in persistent mode, will check
   // whether an update is available, and if that's the case, restart the
   // browser. Note that restart code will strip some of the command line keys
@@ -148,7 +149,8 @@ class BrowserProcess {
   // background mode. For the full list of "blacklisted" keys, refer to
   // |kSwitchesToRemoveOnAutorestart| array in browser_process_impl.cc.
   virtual void StartAutoupdateTimer() = 0;
-#endif
+
+#endif  // OS_WIN
 
   // Return true iff we found the inspector files on disk. It's possible to
   // call this function before we have a definite answer from the disk. In that