Move platform abstraction to base library

src/snapshot-source-sink.h

 // Copyright 2012 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_SNAPSHOT_SOURCE_SINK_H_
 #define V8_SNAPSHOT_SOURCE_SINK_H_
 
-#include "src/checks.h"
+#include "src/base/logging.h"
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 
 
 /**
  * Source to read snapshot and builtins files from.
  *
  * Note: Memory ownership remains with callee.
@@ skipping 60 matching lines @@
   void PutRaw(byte* data, int number_of_bytes, const char* description);
   void PutBlob(byte* data, int number_of_bytes, const char* description);
   virtual int Position() = 0;
 };
 
 
 }  // namespace v8::internal
 }  // namespace v8
 
 #endif  // V8_SNAPSHOT_SOURCE_SINK_H_