Refactor KeySystems code to call a function to populate the info. (relanding r221932)

content/renderer/media/crypto/key_systems_info.h

Index: content/renderer/media/crypto/key_systems_info.h
diff --git a/content/renderer/media/crypto/key_systems_info.h b/content/renderer/media/crypto/key_systems_info.h
index 1aaa68a8540f0934b1cfc4b00b16b3bf732eb195..989475beacc8c4ffb9ab8ff81d4b97f8c3eafb5b 100644
--- a/content/renderer/media/crypto/key_systems_info.h
+++ b/content/renderer/media/crypto/key_systems_info.h
@@ -8,6 +8,8 @@
 #include <string>
 
 #include "base/basictypes.h"
+// TODO(ddorwin): Remove when AddKeySystems is removed.
+#include "content/public/renderer/key_system_info.h"
 
 namespace WebKit {
 class WebString;
@@ -16,7 +18,7 @@ class WebString;
 namespace content {
 
 // TODO(ddorwin): Move registration to ContentClient.
-void RegisterKeySystems();
+void AddKeySystems(std::vector<KeySystemInfo>* key_systems_info);
 
 // Returns true if canPlayType should return an empty string for |key_system|.
 bool IsCanPlayTypeSuppressed(const std::string& key_system);