Remove calls to IsRunningSequenceOnCurrentThread() from crash_handler_host_linux.cc

components/crash/content/browser/crash_handler_host_linux.h

Index: components/crash/content/browser/crash_handler_host_linux.h
diff --git a/components/crash/content/browser/crash_handler_host_linux.h b/components/crash/content/browser/crash_handler_host_linux.h
index efb7520b353cb214d9ad5af6c8ceba15ba8fb9b6..1c463644ccda90ef762e9c3d5d4cf25b01500849 100644
--- a/components/crash/content/browser/crash_handler_host_linux.h
+++ b/components/crash/content/browser/crash_handler_host_linux.h
@@ -14,6 +14,7 @@
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
+#include "base/sequence_checker.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "components/crash/content/app/breakpad_linux_impl.h"
 
@@ -102,6 +103,9 @@ class CrashHandlerHostLinux : public base::MessageLoopForIO::Watcher,
   // by other tasks.
   base::SequencedWorkerPool::SequenceToken worker_pool_token_;
 
+  // Used to verify that calls to WriteDumpFile() are sequenced.
+  base::SequenceChecker write_dump_file_sequence_checker_;
+
   DISALLOW_COPY_AND_ASSIGN(CrashHandlerHostLinux);
 };