Cleanup: Pass std::string as const reference from ash/ + minor coding style changes in base/

base/logging.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 BASE_LOGGING_H_
 #define BASE_LOGGING_H_
 
 #include <cassert>
 #include <string>
 #include <cstring>
@@ skipping 788 matching lines @@
   };
 
   SaveLastError last_error_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(LogMessage);
 };
 
 // A non-macro interface to the log facility; (useful
 // when the logging level is not a compile-time constant).
-inline void LogAtLevel(int const log_level, std::string const &msg) {
+inline void LogAtLevel(int log_level, const std::string& msg) {
   LogMessage(__FILE__, __LINE__, log_level).stream() << msg;
 }
 
 // This class is used to explicitly ignore values in the conditional
 // logging macros.  This avoids compiler warnings like "value computed
 // is not used" and "statement has no effect".
 class LogMessageVoidify {
  public:
   LogMessageVoidify() { }
   // This has to be an operator with a precedence lower than << but
@@ skipping 144 matching lines @@
 #elif NOTIMPLEMENTED_POLICY == 5
 #define NOTIMPLEMENTED() do {\
   static bool logged_once = false;\
   LOG_IF(ERROR, !logged_once) << NOTIMPLEMENTED_MSG;\
   logged_once = true;\
 } while(0);\
 EAT_STREAM_PARAMETERS
 #endif
 
 #endif  // BASE_LOGGING_H_