Cleanup: Better constify some strings in base.

base/debug/trace_event_impl_constants.cc

 // Copyright (c) 2013 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"
 
 namespace base {
 namespace debug {
 
 // Enable everything but debug and test categories by default.
-const char* CategoryFilter::kDefaultCategoryFilterString = "-*Debug,-*Test";
+const char CategoryFilter::kDefaultCategoryFilterString[] = "-*Debug,-*Test";
 
 // Constant used by TraceLog's internal implementation of trace_option.
 const TraceLog::InternalTraceOptions
     TraceLog::kInternalNone = 0;
 const TraceLog::InternalTraceOptions
     TraceLog::kInternalRecordUntilFull = 1 << 0;
 const TraceLog::InternalTraceOptions
     TraceLog::kInternalRecordContinuously = 1 << 1;
 const TraceLog::InternalTraceOptions
     TraceLog::kInternalEnableSampling = 1 << 2;
 const TraceLog::InternalTraceOptions
     TraceLog::kInternalEchoToConsole = 1 << 3;
 const TraceLog::InternalTraceOptions
     TraceLog::kInternalRecordAsMuchAsPossible = 1 << 4;
 
 }  // namespace debug
 }  // namespace base