Move strings-storage.* to the profiler directory

src/profiler/strings-storage.h

 // Copyright 2015 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_STRINGS_STORAGE_H_
-#define V8_STRINGS_STORAGE_H_
+#ifndef V8_PROFILER_STRINGS_STORAGE_H_
+#define V8_PROFILER_STRINGS_STORAGE_H_
 
 #include "src/allocation.h"
 #include "src/hashmap.h"
 
 namespace v8 {
 namespace internal {
 
 // Provides a storage of strings allocated in C++ heap, to hold them
 // forever, even if they disappear from JS heap or external storage.
 class StringsStorage {
@@ skipping 18 matching lines @@
   HashMap::Entry* GetEntry(const char* str, int len);
 
   uint32_t hash_seed_;
   HashMap names_;
 
   DISALLOW_COPY_AND_ASSIGN(StringsStorage);
 };
 }  // namespace internal
 }  // namespace v8
 
-#endif  // V8_STRINGS_STORAGE_H_
+#endif  // V8_PROFILER_STRINGS_STORAGE_H_