cros: Remove obsolete about:flags switch for memory widget

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 89bae2de21e2566404ece9b907344468fb9e4eac..9a03fc9a7cbb9850f09b1b72e571008e01ee38d2 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1201,9 +1201,6 @@ const char kWindowSize[]                    = "window-size";
 // use Chromium's network stack to fetch, and V8 to evaluate.
 const char kWinHttpProxyResolver[]          = "winhttp-proxy-resolver";
 
-// Shows a memory consumption status area widget for OOM debugging.
-const char kMemoryWidget[]                  = "memory-widget";
-
 #if defined(OS_CHROMEOS)
 // Disables gdata content provider.
 const char kDisableGData[]                  = "disable-gdata";