[DevTools] Make V8's ProtocolMessage a std::vector<uint8_t> for now.

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

Change-Id: Ifdf700171ebc46cfbd6ce0af9a6f6ba73419a5a8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1887689
Auto-Submit: Johannes Henkel <johannes@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Johannes Henkel <johannes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64626}

src/inspector/string-util.cc

@@ -125,20 +125,6 @@ std::unique_ptr<protocol::Value> StringUtil::parseJSON(const String16& string) {
                              static_cast<int>(string.length()));
 }
 
-// static
-ProtocolMessage StringUtil::jsonToMessage(String message) {
-  ProtocolMessage result;
-  result.json = std::move(message);
-  return result;
-}
-
-// static
-ProtocolMessage StringUtil::binaryToMessage(std::vector<uint8_t> message) {
-  ProtocolMessage result;
-  result.binary = std::move(message);
-  return result;
-}
-
 // static
 void StringUtil::builderAppendQuotedString(StringBuilder& builder,
                                            const String& str) {

src/inspector/string-util.h

@@ -22,10 +22,7 @@ class Value;
 
 using String = v8_inspector::String16;
 using StringBuilder = v8_inspector::String16Builder;
-struct ProtocolMessage {
-  String json;
-  std::vector<uint8_t> binary;
-};
+using ProtocolMessage = std::vector<uint8_t>;
 
 class StringUtil {
  public:
@@ -72,8 +69,6 @@ class StringUtil {
   }
   static std::unique_ptr<protocol::Value> parseJSON(const String16& json);
   static std::unique_ptr<protocol::Value> parseJSON(const StringView& json);
-  static ProtocolMessage jsonToMessage(String message);
-  static ProtocolMessage binaryToMessage(std::vector<uint8_t> message);
 
   static String fromUTF8(const uint8_t* data, size_t length) {
     return String16::fromUTF8(reinterpret_cast<const char*>(data), length);