Fix bug: AppShell: CHECK failure in PeerConnection init.

extensions/common/switches.cc

Index: extensions/common/switches.cc
diff --git a/extensions/common/switches.cc b/extensions/common/switches.cc
index d9eba9ebc163e7361c5abd57e02df58323785fe6..0f5675792e83e3fc8dc8f7a362820e88c53e981e 100644
--- a/extensions/common/switches.cc
+++ b/extensions/common/switches.cc
@@ -19,9 +19,6 @@ const char kAllowLegacyExtensionManifests[] =
 // Enables the <appview> tag in platform apps.
 const char kAppView[] = "app-view";
 
-// Request pages to be dumped as text once they finished loading.
-const char kDumpRenderTree[] = "dump-render-tree";
-
 // Enables extension options to be embedded in chrome://extensions rather than
 // a new tab.
 const char kEmbeddedExtensionOptions[] = "embedded-extension-options";