Remove --extra-chrome-flags command line switch.

chrome/test/base/test_switches.h

Index: chrome/test/base/test_switches.h
diff --git a/chrome/test/base/test_switches.h b/chrome/test/base/test_switches.h
index c14ada51bb168c49f2da69c9ed9cfcb578280f95..9b4cd2b9a607a092e6d756ed78b66bf6dd60903a 100644
--- a/chrome/test/base/test_switches.h
+++ b/chrome/test/base/test_switches.h
@@ -12,7 +12,6 @@ namespace switches {
 // All switches in alphabetical order. The switches should be documented
 // alongside the definition of their values in the .cc file.
 extern const char kAlsoEmitSuccessLogs[];
-extern const char kExtraChromeFlags[];
 extern const char kEnableChromiumBranding[];
 extern const char kEnableErrorDialogs[];