Verify MediaKeys parameter values consistently

Source/platform/drm/ContentDecryptionModule.cpp

Index: Source/platform/drm/ContentDecryptionModule.cpp
diff --git a/Source/platform/drm/ContentDecryptionModule.cpp b/Source/platform/drm/ContentDecryptionModule.cpp
index b27a50cb6fdbc63aea63f17b74818fdaef08567c..8effdfc56a4289b9882ecb1228c68c9e5b69e984 100644
--- a/Source/platform/drm/ContentDecryptionModule.cpp
+++ b/Source/platform/drm/ContentDecryptionModule.cpp
@@ -37,14 +37,6 @@
 
 namespace WebCore {
 
-bool ContentDecryptionModule::supportsKeySystem(const String& keySystem)
-{
-    // FIXME: Chromium should handle this, possibly using
-    // MIMETypeRegistry::isSupportedEncryptedMediaMIMEType().
-    notImplemented();
-    return keySystem == "org.w3.clearkey";
-}
-
 PassOwnPtr<ContentDecryptionModule> ContentDecryptionModule::create(const String& keySystem)
 {
     ASSERT(!keySystem.isEmpty());
@@ -64,14 +56,6 @@ ContentDecryptionModule::~ContentDecryptionModule()
 {
 }
 
-bool ContentDecryptionModule::supportsMIMEType(const String& mimeType)
-{
-    // FIXME: Chromium should handle this, possibly using
-    // MIMETypeRegistry::isSupportedEncryptedMediaMIMEType().
-    notImplemented();
-    return mimeType == "video/webm";
-}
-
 PassOwnPtr<ContentDecryptionModuleSession> ContentDecryptionModule::createSession(ContentDecryptionModuleSessionClient* client)
 {
     return adoptPtr(new ContentDecryptionModuleSession(m_cdm.get(), client));