Make FrameSelection::create() to take LocalFrame as required parameter

third_party/WebKit/Source/core/editing/FrameSelection.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 52 matching lines @@
     DoNotRevealExtent
 };
 
 enum class SelectionDirectionalMode { NonDirectional, Directional };
 
 enum class CaretVisibility;
 
 class CORE_EXPORT FrameSelection final : public GarbageCollectedFinalized<FrameSelection> {
     WTF_MAKE_NONCOPYABLE(FrameSelection);
 public:
-    static FrameSelection* create(LocalFrame* frame = nullptr)
+    static FrameSelection* create(LocalFrame* frame)
     {
         return new FrameSelection(frame);
     }
     ~FrameSelection();
 
     enum EAlteration { AlterationMove, AlterationExtend };
     enum SetSelectionOption {
         // 1 << 0 is reserved for EUserTriggered
         CloseTyping = 1 << 1,
         ClearTypingStyle = 1 << 2,
@@ skipping 253 matching lines @@
 }
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::FrameSelection&);
 void showTree(const blink::FrameSelection*);
 #endif
 
 #endif // FrameSelection_h