Cleanup: Better constify some strings in base.

base/debug/trace_event_android.cc

 // 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.
 
 #include "base/debug/trace_event_impl.h"
 
 #include <fcntl.h>
 
 #include "base/debug/trace_event.h"
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 #include "base/synchronization/waitable_event.h"
 
 namespace {
 
 int g_atrace_fd = -1;
-const char* kATraceMarkerFile = "/sys/kernel/debug/tracing/trace_marker";
+const char kATraceMarkerFile[] = "/sys/kernel/debug/tracing/trace_marker";
 
 void WriteEvent(
     char phase,
     const char* category_group,
     const char* name,
     unsigned long long id,
     const char** arg_names,
     const unsigned char* arg_types,
     const base::debug::TraceEvent::TraceValue* arg_values,
     const scoped_refptr<base::debug::ConvertableToTraceFormat>*
@@ skipping 161 matching lines @@
   double now_in_seconds = now.ToInternalValue() / 1000000.0;
   std::string marker = StringPrintf(
       "trace_event_clock_sync: parent_ts=%f\n", now_in_seconds);
   if (write(atrace_fd, marker.c_str(), marker.size()) == -1)
     PLOG(WARNING) << "Couldn't write to " << kATraceMarkerFile;
   close(atrace_fd);
 }
 
 }  // namespace debug
 }  // namespace base