Always dispose backing store.

src/scanner.h

 // Copyright 2011 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.
 
 // Features shared by parsing and pre-parsing scanners.
 
 #ifndef V8_SCANNER_H_
 #define V8_SCANNER_H_
 
 #include "src/allocation.h"
@@ skipping 148 matching lines @@
 };
 
 
 // ----------------------------------------------------------------------------
 // LiteralBuffer -  Collector of chars of literals.
 
 class LiteralBuffer {
  public:
   LiteralBuffer() : is_one_byte_(true), position_(0), backing_store_() { }
 
-  ~LiteralBuffer() {
-    if (backing_store_.length() > 0) {
-      backing_store_.Dispose();
-    }
-  }
+  ~LiteralBuffer() { backing_store_.Dispose(); }
 
   INLINE(void AddChar(uint32_t code_unit)) {
     if (position_ >= backing_store_.length()) ExpandBuffer();
     if (is_one_byte_) {
       if (code_unit <= unibrow::Latin1::kMaxChar) {
         backing_store_[position_] = static_cast<byte>(code_unit);
         position_ += kOneByteSize;
         return;
       }
       ConvertToTwoByte();
@@ skipping 576 matching lines @@
   bool has_line_terminator_before_next_;
   // Whether there is a multi-line comment that contains a
   // line-terminator after the current token, and before the next.
   bool has_multiline_comment_before_next_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_SCANNER_H_