[mojo talk demo] Convert utility process CheckMediaFile IPC to mojo

chrome/browser/media_galleries/fileapi/safe_audio_video_checker.cc

Index: chrome/browser/media_galleries/fileapi/safe_audio_video_checker.cc
diff --git a/chrome/browser/media_galleries/fileapi/safe_audio_video_checker.cc b/chrome/browser/media_galleries/fileapi/safe_audio_video_checker.cc
index 85dcf4fb480c08009ff22fd535b63b64ddc20657..674445564a589efe78334bc210529468d7baf7ed 100644
--- a/chrome/browser/media_galleries/fileapi/safe_audio_video_checker.cc
+++ b/chrome/browser/media_galleries/fileapi/safe_audio_video_checker.cc
@@ -22,6 +22,7 @@
 #include "content/public/browser/utility_process_host.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_platform_file.h"
+#include "services/service_manager/public/cpp/interface_provider.h"
 #include "ui/base/l10n/l10n_util.h"
 
 SafeAudioVideoChecker::SafeAudioVideoChecker(
@@ -43,21 +44,21 @@ void SafeAudioVideoChecker::Start() {
     return;
   }
 
-  IPC::PlatformFileForTransit file_for_transit =
-      IPC::TakePlatformFileForTransit(std::move(file_));
-  if (file_for_transit == IPC::InvalidPlatformFileForTransit()) {
-    OnCheckingFinished(false /* valid? */);
-    return;
-  }
-
   utility_process_host_ = content::UtilityProcessHost::Create(
       this, base::ThreadTaskRunnerHandle::Get())->AsWeakPtr();
   utility_process_host_->SetName(l10n_util::GetStringUTF16(
       IDS_UTILITY_PROCESS_MEDIA_FILE_CHECKER_NAME));
 
+  utility_process_host_->Start();
+
+  utility_process_host_->GetRemoteInterfaces()->GetInterface(&interface_);
+  interface_.set_connection_error_handler(
+      base::Bind(&SafeAudioVideoChecker::OnCheckingFinished, this, false));
+
   const int64_t kFileDecodeTimeInMS = 250;
-  utility_process_host_->Send(new ChromeUtilityMsg_CheckMediaFile(
-      kFileDecodeTimeInMS, file_for_transit));
+  interface_->CheckMediaFile(
+      kFileDecodeTimeInMS, std::move(file_),
+      base::Bind(&SafeAudioVideoChecker::OnCheckingFinished, this));
 }
 
 SafeAudioVideoChecker::~SafeAudioVideoChecker() {}
@@ -67,6 +68,7 @@ void SafeAudioVideoChecker::OnCheckingFinished(bool valid) {
   if (state_ != STARTED_STATE)
     return;
   state_ = FINISHED_STATE;
+  interface_.reset();
 
   callback_.Run(valid ? base::File::FILE_OK :
                         base::File::FILE_ERROR_SECURITY);
@@ -77,11 +79,5 @@ void SafeAudioVideoChecker::OnProcessCrashed(int exit_code) {
 }
 
 bool SafeAudioVideoChecker::OnMessageReceived(const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(SafeAudioVideoChecker, message)
-    IPC_MESSAGE_HANDLER(ChromeUtilityHostMsg_CheckMediaFile_Finished,
-        OnCheckingFinished)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
+  return false;
 }