Fix a bug that caused Chrome OS system preferences not to work in the guest mode.

chrome/browser/ui/browser_init.cc

Index: chrome/browser/ui/browser_init.cc
diff --git a/chrome/browser/ui/browser_init.cc b/chrome/browser/ui/browser_init.cc
index e379855542d85f59401a433df0f95bd3f600d522..ca0b49ece1c85e4d0a55c91d66f53cc42b114117 100644
--- a/chrome/browser/ui/browser_init.cc
+++ b/chrome/browser/ui/browser_init.cc
@@ -502,6 +502,13 @@ bool BrowserInit::LaunchBrowser(const CommandLine& command_line,
   }
 
 #if defined(OS_CHROMEOS)
+  // Initialize Chrome OS preferences like touch pad sensitivity. For the
+  // preferences to work in the guest mode, the initialization has to be
+  // done after |profile| is switched to the off-the-record profile (which
+  // is actually GuestSessionProfile in the guest mode). See the
+  // GetOffTheRecordProfile() call above.
+  profile->InitChromeOSPreferences();
+
   // Create the WmMessageListener so that it can listen for messages regardless
   // of what window has focus.
   chromeos::WmMessageListener::GetInstance();