[DevTools] Make Blink's ProtocolMessage a WebVector<uint8_t> for now.

Also we're not creating these any more via StringUtil in blink,
so these two helpers can go.

Change-Id: Id676e4c35bc00392166f00f645178cd17720d02b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888270
Auto-Submit: Johannes Henkel <johannes@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Johannes Henkel <johannes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710466}

third_party/blink/renderer/core/inspector/v8_inspector_string.cc

@@ -58,20 +58,6 @@ std::unique_ptr<protocol::Value> StringUtil::parseJSON(const String& string) {
       string.length());
 }
 
-// static
-ProtocolMessage StringUtil::jsonToMessage(const String& message) {
-  ProtocolMessage result;
-  result.json = message;
-  return result;
-}
-
-// static
-ProtocolMessage StringUtil::binaryToMessage(WebVector<uint8_t> message) {
-  ProtocolMessage result;
-  result.binary = std::move(message);
-  return result;
-}
-
 // static
 void StringUtil::builderAppendQuotedString(StringBuilder& builder,
                                            const String& str) {

third_party/blink/renderer/core/inspector/v8_inspector_string.h

@@ -38,11 +38,7 @@ class Value;
 
 using String = WTF::String;
 using StringBuilder = WTF::StringBuilder;
-
-struct ProtocolMessage {
-  String json;
-  WebVector<uint8_t> binary;
-};
+using ProtocolMessage = WebVector<uint8_t>;
 
 class CORE_EXPORT StringUtil {
   STATIC_ONLY(StringUtil);
@@ -83,8 +79,6 @@ class CORE_EXPORT StringUtil {
     return builder.ToString();
   }
   static std::unique_ptr<protocol::Value> parseJSON(const String&);
-  static ProtocolMessage jsonToMessage(const String& message);
-  static ProtocolMessage binaryToMessage(WebVector<uint8_t> message);
 
   static String fromUTF8(const uint8_t* data, size_t length) {
     return String::FromUTF8(reinterpret_cast<const char*>(data), length);