Move ReadFileToString to the base namespace.

base/debug/proc_maps_linux.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/proc_maps_linux.h"
 
 #if defined(OS_LINUX)
 #include <inttypes.h>
 #endif
 
 #include "base/file_util.h"
 #include "base/strings/string_split.h"
 
 #if defined(OS_ANDROID)
 // Bionic's inttypes.h defines PRI/SCNxPTR as an unsigned long int, which
 // is incompatible with Bionic's stdint.h defining uintptr_t as a unsigned int:
 // https://code.google.com/p/android/issues/detail?id=57218
 #undef SCNxPTR
 #define SCNxPTR "x"
 #endif
 
 namespace base {
 namespace debug {
 
 bool ReadProcMaps(std::string* proc_maps) {
   FilePath proc_maps_path("/proc/self/maps");
-  return file_util::ReadFileToString(proc_maps_path, proc_maps);
+  return ReadFileToString(proc_maps_path, proc_maps);
 }
 
 bool ParseProcMaps(const std::string& input,
                    std::vector<MappedMemoryRegion>* regions_out) {
   std::vector<MappedMemoryRegion> regions;
 
   // This isn't async safe nor terribly efficient, but it doesn't need to be at
   // this point in time.
   std::vector<std::string> lines;
   SplitString(input, '\n', &lines);
@@ skipping 54 matching lines @@
     regions.push_back(region);
     regions.back().path.assign(line + path_index);
   }
 
   regions_out->swap(regions);
   return true;
 }
 
 }  // namespace debug
 }  // namespace base