Mark single-argument inline constructors as 'explicit'.

src/jsregexp.h

 // 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 1429 matching lines @@
                                    bool multiline,
                                    Handle<String> pattern,
                                    bool is_ascii);
 
   static void DotPrint(const char* label, RegExpNode* node, bool ignore_case);
 };
 
 
 class OffsetsVector {
  public:
-  inline OffsetsVector(int num_registers)
+  explicit inline OffsetsVector(int num_registers)
       : offsets_vector_length_(num_registers) {
     if (offsets_vector_length_ > Isolate::kJSRegexpStaticOffsetsVectorSize) {
       vector_ = NewArray<int>(offsets_vector_length_);
     } else {
       vector_ = Isolate::Current()->jsregexp_static_offsets_vector();
     }
   }
   inline ~OffsetsVector() {
     if (offsets_vector_length_ > Isolate::kJSRegexpStaticOffsetsVectorSize) {
       DeleteArray(vector_);
@@ skipping 13 matching lines @@
   int* vector_;
   int offsets_vector_length_;
 
   friend class ExternalReference;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSREGEXP_H_