Remove obsolete seccomp_unwinder for legacy (pre-BPF) sandbox

src/client/linux/microdump_writer/microdump_writer.cc

 // Copyright (c) 2014, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // This translation unit generates microdumps into the console (logcat on
 // Android). See crbug.com/410294 for more info and design docs.
 
 #include "client/linux/microdump_writer/microdump_writer.h"
 
 #include <sys/utsname.h>
 
-#include "client/linux/dump_writer_common/seccomp_unwinder.h"
 #include "client/linux/dump_writer_common/thread_info.h"
 #include "client/linux/dump_writer_common/ucontext_reader.h"
 #include "client/linux/handler/exception_handler.h"
 #include "client/linux/log/log.h"
 #include "client/linux/minidump_writer/linux_ptrace_dumper.h"
 #include "common/linux/linux_libc_support.h"
 
 namespace {
 
 using google_breakpad::ExceptionHandler;
 using google_breakpad::LinuxDumper;
 using google_breakpad::LinuxPtraceDumper;
 using google_breakpad::MappingInfo;
 using google_breakpad::MappingList;
 using google_breakpad::RawContextCPU;
-using google_breakpad::SeccompUnwinder;
 using google_breakpad::ThreadInfo;
 using google_breakpad::UContextReader;
 
 const size_t kLineBufferSize = 2048;
 
 class MicrodumpWriter {
  public:
   MicrodumpWriter(const ExceptionHandler::CrashContext* context,
                   const MappingList& mappings,
                   const char* build_fingerprint,
@@ skipping 216 matching lines @@
       if (!DumpThreadStack(thread.thread_id, stack_ptr, -1, &stack_copy))
         return false;
 
       RawContextCPU cpu;
       my_memset(&cpu, 0, sizeof(RawContextCPU));
 #if !defined(__ARM_EABI__) && !defined(__mips__)
       UContextReader::FillCPUContext(&cpu, ucontext_, float_state_);
 #else
       UContextReader::FillCPUContext(&cpu, ucontext_);
 #endif
-      if (stack_copy)
-        SeccompUnwinder::PopSeccompStackFrame(&cpu, thread, stack_copy);
       DumpCPUState(&cpu);
     }
     return true;
   }
 
   void DumpCPUState(RawContextCPU* cpu) {
     LogAppend("C ");
     LogAppend(cpu, sizeof(*cpu));
     LogCommitLine();
   }
@@ skipping 118 matching lines @@
     dumper.set_crash_thread(context->tid);
   }
   MicrodumpWriter writer(context, mappings, build_fingerprint, product_info,
                          &dumper);
   if (!writer.Init())
     return false;
   return writer.Dump();
 }
 
 }  // namespace google_breakpad