Move platform abstraction to base library

src/unicode-inl.h

 // Copyright 2007-2010 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_UNICODE_INL_H_
 #define V8_UNICODE_INL_H_
 
 #include "src/unicode.h"
-#include "src/checks.h"
+#include "src/base/logging.h"
 #include "src/utils.h"
 
 namespace unibrow {
 
 template <class T, int s> bool Predicate<T, s>::get(uchar code_point) {
   CacheEntry entry = entries_[code_point & kMask];
   if (entry.code_point_ == code_point) return entry.value_;
   return CalculateValue(code_point);
 }
 
@@ skipping 176 matching lines @@
   // Copy the rest the slow way.
   WriteUtf16Slow(unbuffered_start_,
                  data + buffer_length,
                  length - buffer_length);
   return length;
 }
 
 }  // namespace unibrow
 
 #endif  // V8_UNICODE_INL_H_