Remove unused switch kChromeFrame.

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 859aad1c1e71c89c4861f18b78fc45786a3a03c8..4009ceb2dd3eb14b2ed705fcd793bccbdd345957 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -166,10 +166,6 @@ const char kCheckForUpdateIntervalSec[]     = "check-for-update-interval";
 const char kCheckCloudPrintConnectorPolicy[] =
     "check-cloud-print-connector-policy";
 
-// Run Chrome in Chrome Frame mode. This means that Chrome expects to be run
-// as a dependent process of the Chrome Frame plugin.
-const char kChromeFrame[]                   = "chrome-frame";
-
 // 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";