Fix two deallocation bugs identified by Coverity Prevent....

src/string-stream.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 26 matching lines @@
 static List<HeapObject*, PreallocatedStorage>* debug_object_cache = NULL;
 static Object* current_security_token = NULL;
 
 
 char* HeapStringAllocator::allocate(unsigned bytes) {
   space_ = NewArray<char>(bytes);
   return space_;
 }
 
 
-NoAllocationStringAllocator::NoAllocationStringAllocator(unsigned bytes) {
-  size_ = bytes;
-  space_ = NewArray<char>(bytes);
-}
-
-
 NoAllocationStringAllocator::NoAllocationStringAllocator(char* memory,
                                                          unsigned size) {
   size_ = size;
   space_ = memory;
 }
 
 
 bool StringStream::Put(char c) {
   if (full()) return false;
   ASSERT(length_ < capacity_);
@@ skipping 511 matching lines @@
 
 // Only grow once to the maximum allowable size.
 char* NoAllocationStringAllocator::grow(unsigned* bytes) {
   ASSERT(size_ >= *bytes);
   *bytes = size_;
   return space_;
 }
 
 
 } }  // namespace v8::internal