zygote: Don't CHECK if browser gone during zygote startup

content/common/sandbox_linux/sandbox_linux.h

 // Copyright (c) 2012 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 CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_LINUX_H_
 #define CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_LINUX_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 121 matching lines @@
     DCHECK_NE(-1, proc_fd_);
     return proc_fd_;
   }
 
 #if defined(ANY_OF_AMTLU_SANITIZER)
   __sanitizer_sandbox_arguments* sanitizer_args() const {
     return sanitizer_args_.get();
   };
 #endif
 
+  void set_exiting_before_initialize_sandbox(bool exiting) {
+    exiting_before_initialize_sandbox_ = exiting;
+  }
+
  private:
   friend struct base::DefaultSingletonTraits<LinuxSandbox>;
 
   LinuxSandbox();
   ~LinuxSandbox();
 
   // Some methods are static and get an instance of the Singleton. These
   // are the non-static implementations.
   bool InitializeSandboxImpl();
   void StopThreadImpl(base::Thread* thread);
@@ skipping 20 matching lines @@
   int proc_fd_;
   bool seccomp_bpf_started_;
   // The value returned by GetStatus(). Gets computed once and then cached.
   int sandbox_status_flags_;
   // Did PreinitializeSandbox() run?
   bool pre_initialized_;
   bool seccomp_bpf_supported_;  // Accurate if pre_initialized_.
   bool seccomp_bpf_with_tsync_supported_;  // Accurate if pre_initialized_.
   bool yama_is_enforcing_;  // Accurate if pre_initialized_.
   bool initialize_sandbox_ran_;  // InitializeSandbox() was called.
+  // Set when exiting due to error during startup. Allows shutdown to happen
+  // without verifying that InitializeSandbox() was called.
+  bool exiting_before_initialize_sandbox_;
   std::unique_ptr<sandbox::SetuidSandboxClient> setuid_sandbox_client_;
 #if defined(ANY_OF_AMTLU_SANITIZER)
   std::unique_ptr<__sanitizer_sandbox_arguments> sanitizer_args_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(LinuxSandbox);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_SANDBOX_LINUX_SANDBOX_LINUX_H_