Revert "Remove OwnPtr from Blink."

third_party/WebKit/Source/modules/webdatabase/DatabaseThread.h

Index: third_party/WebKit/Source/modules/webdatabase/DatabaseThread.h
diff --git a/third_party/WebKit/Source/modules/webdatabase/DatabaseThread.h b/third_party/WebKit/Source/modules/webdatabase/DatabaseThread.h
index afe5454f87ee74375af9c1426bf0d37b67fc05e0..26355298396228021d4869de283107c749eac280 100644
--- a/third_party/WebKit/Source/modules/webdatabase/DatabaseThread.h
+++ b/third_party/WebKit/Source/modules/webdatabase/DatabaseThread.h
@@ -31,8 +31,9 @@
 #include "platform/WebThreadSupportingGC.h"
 #include "platform/heap/Handle.h"
 #include "wtf/HashMap.h"
+#include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
 #include "wtf/ThreadingPrimitives.h"
-#include <memory>
 
 namespace blink {
 
@@ -53,7 +54,7 @@ public:
     void terminate();
 
     // Callable from the main thread or the database thread.
-    void scheduleTask(std::unique_ptr<DatabaseTask>);
+    void scheduleTask(PassOwnPtr<DatabaseTask>);
     bool isDatabaseThread() const;
 
     // Callable only from the database thread.
@@ -71,14 +72,14 @@ private:
     void cleanupDatabaseThread();
     void cleanupDatabaseThreadCompleted();
 
-    std::unique_ptr<WebThreadSupportingGC> m_thread;
+    OwnPtr<WebThreadSupportingGC> m_thread;
 
     // This set keeps track of the open databases that have been used on this thread.
     // This must be updated in the database thread though it is constructed and
     // destructed in the context thread.
     HashSet<CrossThreadPersistent<Database>> m_openDatabaseSet;
 
-    std::unique_ptr<SQLTransactionClient> m_transactionClient;
+    OwnPtr<SQLTransactionClient> m_transactionClient;
     CrossThreadPersistent<SQLTransactionCoordinator> m_transactionCoordinator;
     TaskSynchronizer* m_cleanupSync;