media: Add a web preference to enable encrypted media

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 327f3ac7afc667e00a3fbdc9e7d978a25c53c328..d1a18640e8a7e9d2731e9fa0f26671a691506f92 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -2518,6 +2518,8 @@ void ChromeContentBrowserClient::OverrideWebkitPrefs(
 
   if (!prefs->GetBoolean(prefs::kWebKitPluginsEnabled))
     web_prefs->plugins_enabled = false;
+  web_prefs->encrypted_media_enabled =
+      prefs->GetBoolean(prefs::kWebKitEncryptedMediaEnabled);
   web_prefs->loads_images_automatically =
       prefs->GetBoolean(prefs::kWebKitLoadsImagesAutomatically);