Rewrite references to "wtf/" to "platform/wtf/" in core/layout.

third_party/WebKit/Source/core/layout/ng/geometry/ng_physical_offset.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/ng/geometry/ng_physical_offset.h"
 
-#include "wtf/text/WTFString.h"
+#include "platform/wtf/text/WTFString.h"
 
 namespace blink {
 
 NGPhysicalOffset NGPhysicalOffset::operator+(
     const NGPhysicalOffset& other) const {
   return NGPhysicalOffset{this->left + other.left, this->top + other.top};
 }
 
 NGPhysicalOffset& NGPhysicalOffset::operator+=(const NGPhysicalOffset& other) {
   *this = *this + other;
@@ skipping 16 matching lines @@
 
 String NGPhysicalOffset::ToString() const {
   return String::Format("%dx%d", left.ToInt(), top.ToInt());
 }
 
 std::ostream& operator<<(std::ostream& os, const NGPhysicalOffset& value) {
   return os << value.ToString();
 }
 
 }  // namespace blink