[DevTools] Remove unused from utf16 method.

Change-Id: Ie73b21c284052a66ce18f0686030ee0a11f49d3c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1887631
Commit-Queue: Johannes Henkel <johannes@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Auto-Submit: Johannes Henkel <johannes@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64627}

src/inspector/string-util.h

@@ -74,10 +74,6 @@ class StringUtil {
     return String16::fromUTF8(reinterpret_cast<const char*>(data), length);
   }
 
-  static String fromUTF16(const uint16_t* data, size_t length) {
-    return String16(data, length);
-  }
-
   static String fromUTF16LE(const uint16_t* data, size_t length) {
     return String16::fromUTF16LE(data, length);
   }