Fix some issues found by coverity scans on Node.js

third_party/WebKit/Source/platform/inspector_protocol/String16STL.h

 // Copyright 2016 The Chromium 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 String16STL_h
 #define String16STL_h
 
 #include <cstdlib>
 #include <cstring>
 #include <stdint.h>
@@ skipping 118 matching lines @@
         }
         return hash_code;
     }
 
 private:
     static std::string intToString(int);
     static std::string doubleToString(double);
     // presubmit: allow wstring
     wstring m_impl;
     mutable bool has_hash = false;
-    mutable std::size_t hash_code;
+    mutable std::size_t hash_code = 0;
 };
 
 static inline bool isSpaceOrNewline(UChar c)
 {
     return false;
 }
 
 class String16Builder {
 public:
     String16Builder() { }
@@ skipping 84 matching lines @@
 public:
     String() {};
     String(const String16& other) {};
     operator String16() const { return String16(); };
 };
 } // namespace WTF
 
 using String = WTF::String;
 
 #endif // !defined(String16STL_h)