[DevTools] Fix v8_inspector compilation with node

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

Index: third_party/WebKit/Source/platform/inspector_protocol/String16STL.h
diff --git a/third_party/WebKit/Source/platform/inspector_protocol/String16STL.h b/third_party/WebKit/Source/platform/inspector_protocol/String16STL.h
index 7b185a26b72504f498d1d00bd0b0bc5c78601bfb..e86c4059565c665ea3e11140fdfe37c9f28b715c 100644
--- a/third_party/WebKit/Source/platform/inspector_protocol/String16STL.h
+++ b/third_party/WebKit/Source/platform/inspector_protocol/String16STL.h
@@ -243,6 +243,17 @@ public:
 };
 } // namespace WTF
 
+
+namespace std {
+template<> struct hash<String16> {
+    std::size_t operator()(const String16& string) const
+    {
+        return string.hash();
+    }
+};
+
+} // namespace std
+
 using String = WTF::String;
 
 #endif // !defined(String16STL_h)