Make assertion scopes thread safe.

src/json-parser.h

 // Copyright 2011 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 88 matching lines @@
   // literals. The string must only be double-quoted (not single-quoted), and
   // the only allowed backslash-escapes are ", /, \, b, f, n, r, t and
   // four-digit hex escapes (uXXXX). Any other use of backslashes is invalid.
   Handle<String> ParseJsonString() {
     return ScanJsonString<false>();
   }
 
   bool ParseJsonString(Handle<String> expected) {
     int length = expected->length();
     if (source_->length() - position_ - 1 > length) {
-      AssertNoAllocation no_gc;
+      DisallowHeapAllocation no_gc;
       String::FlatContent content = expected->GetFlatContent();
       if (content.IsAscii()) {
         ASSERT_EQ('"', c0_);
         const uint8_t* input_chars = seq_source_->GetChars() + position_ + 1;
         const uint8_t* expected_chars = content.ToOneByteVector().start();
         for (int i = 0; i < length; i++) {
           uint8_t c0 = input_chars[i];
           if (c0 != expected_chars[i] ||
               c0 == '"' || c0 < 0x20 || c0 == '\\') {
             return false;
@@ skipping 691 matching lines @@
 
   ASSERT_EQ('"', c0_);
   // Advance past the last '"'.
   AdvanceSkipWhitespace();
   return result;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSON_PARSER_H_