Get the default device scale factor from monitor

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 126b37c8548e7097ac68d71e5578ec04fe542d9a..059408c1081570af6941af7681eac926e30297b6 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -36,10 +36,6 @@ const char kBrowserSubprocessPath[]         = "browser-subprocess-path";
 // as a dependent process of the Chrome Frame plugin.
 const char kChromeFrame[]                   = "chrome-frame";
 
-// The default device scale factor to apply to contents in the absence of
-// a viewport meta tag.
-const char kDefaultDeviceScaleFactor[]      = "default-device-scale-factor";
-
 // Disables client-visible 3D APIs, in particular WebGL and Pepper 3D.
 // This is controlled by policy and is kept separate from the other
 // enable/disable switches to avoid accidentally regressing the policy