[inspector] migrate Runtime to new style

src/inspector/string-util.h

Index: src/inspector/string-util.h
diff --git a/src/inspector/string-util.h b/src/inspector/string-util.h
index 30137b8b786f9796b2286780a2c89194b66b1a43..e1a69e8906c42b78e723d974ade9a91ab5095102 100644
--- a/src/inspector/string-util.h
+++ b/src/inspector/string-util.h
@@ -40,11 +40,6 @@ std::unique_ptr<protocol::Value> parseJSON(const String16& json);
 
 }  // namespace protocol
 
-std::unique_ptr<protocol::Value> toProtocolValue(protocol::String* errorString,
-                                                 v8::Local<v8::Context>,
-                                                 v8::Local<v8::Value>,
-                                                 int maxDepth = 1000);
-
 v8::Local<v8::String> toV8String(v8::Isolate*, const String16&);
 v8::Local<v8::String> toV8StringInternalized(v8::Isolate*, const String16&);
 v8::Local<v8::String> toV8StringInternalized(v8::Isolate*, const char*);