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 0e25e8ef40995d9cbded658872ece04900b0534f..b83f84c9f3e1c85485364c2ce127d201231665ed 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -2483,6 +2483,8 @@ 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);