Remove some more unused IPC message group definitions.

BUG=993189

Change-Id: I9bedf477c78188bd52ea4d9a5f0f58ca6cbf52b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2491605Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Abhishek Arya <inferno@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820006}

ipc/ipc_message_start.h

@@ -33,8 +33,6 @@ enum IPCMessageStart {
   EncryptedMediaMsgStart,
   GinJavaBridgeMsgStart,
   ChromeUtilityPrintingMsgStart,
-  OzoneGpuMsgStart,
-  WebTestMsgStart,
   ExtensionsGuestViewMsgStart,
   GuestViewMsgStart,
   MediaPlayerDelegateMsgStart,

ipc/trace_ipc_message.cc

@@ -83,12 +83,6 @@ void WriteIpcMessageIdAsProtozero(uint32_t message_id,
     case ChromeUtilityPrintingMsgStart:
       message_class = ChromeLegacyIpc::CLASS_CHROME_UTILITY_PRINTING;
       break;
-    case OzoneGpuMsgStart:
-      message_class = ChromeLegacyIpc::CLASS_OZONE_GPU;
-      break;
-    case WebTestMsgStart:
-      message_class = ChromeLegacyIpc::CLASS_WEB_TEST;
-      break;
     case ExtensionsGuestViewMsgStart:
       message_class = ChromeLegacyIpc::CLASS_EXTENSIONS_GUEST_VIEW;
       break;

tools/ipc_fuzzer/message_tools/message_list.cc

@@ -47,7 +47,6 @@ static bool check_msgtable() {
   // Exclude test and other non-browser files from consideration.  Do not
   // include message files used inside the actual chrome browser in this list.
   exemptions.push_back(TestMsgStart);
-  exemptions.push_back(WebTestMsgStart);
   exemptions.push_back(WorkerMsgStart);    // Now only used by tests.
   exemptions.push_back(ChromeUtilityPrintingMsgStart);  // BUILDFLAGS, sigh.
 
@@ -63,10 +62,6 @@ static bool check_msgtable() {
   exemptions.push_back(ExtensionWorkerMsgStart);
 #endif  // !defined(OS_ANDROID)
 
-#if !defined(USE_OZONE)
-  exemptions.push_back(OzoneGpuMsgStart);
-#endif  // !defined(USE_OZONE)
-
   for (size_t i = 0; i < MSGTABLE_SIZE; ++i) {
     int class_id = IPC_MESSAGE_ID_CLASS(msgtable[i].id);
     file_name = msgtable[i].file;