Remove duplicated provideMediaKeysTo() in MediaKeysClient.h

Source/web/MediaKeysClientImpl.cpp

Index: Source/web/MediaKeysClientImpl.cpp
diff --git a/Source/web/MediaKeysClientImpl.cpp b/Source/web/MediaKeysClientImpl.cpp
index d78da372c3785309d2a465917924a986df6f3492..78c839f23c34f5abc6cb73cfe4e48e7573b5e0ce 100644
--- a/Source/web/MediaKeysClientImpl.cpp
+++ b/Source/web/MediaKeysClientImpl.cpp
@@ -19,6 +19,11 @@ MediaKeysClientImpl::MediaKeysClientImpl()
 {
 }
 
+PassOwnPtr<MediaKeysClient> MediaKeysClientImpl::create()
+{
+    return adoptPtr(new MediaKeysClientImpl());
+}
+
 PassOwnPtr<WebContentDecryptionModule> MediaKeysClientImpl::createContentDecryptionModule(WebCore::ExecutionContext* executionContext, const String& keySystem)
 {
     Document* document = toDocument(executionContext);