Remove Chrome Frame's delay shutdown field trial.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 8993c39bca1368337fb0f6315be9892d204d73b6..813b01668a6baa007a20533d690452d31160531b 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -151,10 +151,6 @@ const char kCheckCloudPrintConnectorPolicy[] =
 // as a dependent process of the Chrome Frame plugin.
 const char kChromeFrame[]                   = "chrome-frame";
 
-// Tells Chrome to delay shutdown (for a specified number of seconds) when a
-// Chrome Frame automation channel is closed.
-const char kChromeFrameShutdownDelay[]      = "chrome-frame-shutdown-delay";
-
 // Tells chrome to load the specified version of chrome.dll on Windows. If this
 // version cannot be loaded, Chrome will exit.
 const char kChromeVersion[]                 = "chrome-version";