[inspector] fix timestamp formatting with non C locales

src/inspector/string-16.h

Index: src/inspector/string-16.h
diff --git a/src/inspector/string-16.h b/src/inspector/string-16.h
index 94069479579fafaa6cffd3b1b80064914b9a3d3d..6dc7759de059e1151731da35177c05a47826540f 100644
--- a/src/inspector/string-16.h
+++ b/src/inspector/string-16.h
@@ -35,8 +35,7 @@ class String16 {
   static String16 fromInteger(int);
   static String16 fromInteger(size_t);
   static String16 fromDouble(double);
-  static String16 fromDoublePrecision3(double);
-  static String16 fromDoublePrecision6(double);
+  static String16 fromDouble(double, int precision);
 
   int toInteger(bool* ok = nullptr) const;
   String16 stripWhiteSpace() const;