Move the SeccompSupportDetector to be in-process.

chrome/browser/android/seccomp_support_detector.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ANDROID_SECCOMP_SUPPORT_DETECTOR_H_
 #define CHROME_BROWSER_ANDROID_SECCOMP_SUPPORT_DETECTOR_H_
 
 #include "base/compiler_specific.h"
-#include "content/public/browser/utility_process_host_client.h"
+#include "base/memory/ref_counted.h"
 
 // This class is used to report via UMA the Android kernel version and
-// level of seccomp-bpf support. The kernel version is read from the blocking
-// thread pool, while seccomp support is tested in a utility process, in case
-// the probing causes a crash.
-class SeccompSupportDetector : public content::UtilityProcessHostClient {
+// level of seccomp-bpf support. The operations are performed on the
+// blocking thread pool.
+class SeccompSupportDetector
+    : public base::RefCountedThreadSafe<SeccompSupportDetector> {
  public:
   // Starts the detection process. This should be called once per browser
   // session. This is safe to call from any thread.
   static void StartDetection();
 
  private:
+  friend class base::RefCountedThreadSafe<SeccompSupportDetector>;
+
   SeccompSupportDetector();
-  ~SeccompSupportDetector() override;
+  ~SeccompSupportDetector();
 
   // Called on the blocking thread pool. This reads the utsname and records
   // the kernel version.
   void DetectKernelVersion();
 
-  // Called on the IO thread. This starts a utility process to detect seccomp.
+  // Called on the blocking thread pool. This tests whether the system
+  // supports PR_SET_SECCOMP.
   void DetectSeccomp();
 
-  // UtilityProcessHostClient:
-  void OnProcessCrashed(int exit_code) override;
-  bool OnMessageReceived(const IPC::Message& message) override;
-
-  void OnDetectPrctl(bool prctl_supported);
-
   DISALLOW_COPY_AND_ASSIGN(SeccompSupportDetector);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_SECCOMP_SUPPORT_DETECTOR_H_