Remove unused EnableAdviewSrcAttribute command line flag.

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 dc2fe04c75c8c86e098674d0348348d2933c52f7..067c8937e953b2189e349965b96927c5c01af951 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -546,10 +546,6 @@ const char kEnableAdview[]                  = "enable-adview";
 // If set, the app list will be enabled as if enabled from CWS.
 const char kEnableAppList[]                 = "enable-app-list";
 
-// Enables specifying a "src" attribute on <adview> elements
-// (for testing purposes, to skip the whitelist).
-const char kEnableAdviewSrcAttribute[]      = "enable-adview-src-attribute";
-
 // Enables the <window-controls> tag in platform apps.
 const char kEnableAppWindowControls[]       = "enable-app-window-controls";