Revert of Update SplitString calls to new form

base/process/process_metrics_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/process/process_metrics.h"
 
 #include <dirent.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/time.h>
@@ skipping 49 matching lines @@
       return 0;
   }
 
   StringPairs pairs;
   SplitStringIntoKeyValuePairs(status, ':', '\n', &pairs);
   TrimKeyValuePairs(&pairs);
   for (size_t i = 0; i < pairs.size(); ++i) {
     const std::string& key = pairs[i].first;
     const std::string& value_str = pairs[i].second;
     if (key == field) {
-      std::vector<StringPiece> split_value_str = SplitStringPiece(
-          value_str, " ", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
+      std::vector<std::string> split_value_str;
+      SplitString(value_str, ' ', &split_value_str);
       if (split_value_str.size() != 2 || split_value_str[1] != "kB") {
         NOTREACHED();
         return 0;
       }
       size_t value;
       if (!StringToSizeT(split_value_str[0], &value)) {
         NOTREACHED();
         return 0;
       }
       return value;
@@ skipping 279 matching lines @@
   std::string statm;
   {
     FilePath statm_file = internal::GetProcPidDir(process_).Append("statm");
     // Synchronously reading files in /proc does not hit the disk.
     ThreadRestrictions::ScopedAllowIO allow_io;
     bool ret = ReadFileToString(statm_file, &statm);
     if (!ret || statm.length() == 0)
       return false;
   }
 
-  std::vector<StringPiece> statm_vec = SplitStringPiece(
-      statm, " ", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
+  std::vector<std::string> statm_vec;
+  SplitString(statm, ' ', &statm_vec);
   if (statm_vec.size() != 7)
     return false;  // Not the format we expect.
 
   int statm_rss, statm_shared;
   bool ret = true;
   ret &= StringToInt(statm_vec[1], &statm_rss);
   ret &= StringToInt(statm_vec[2], &statm_shared);
 
   ws_usage->priv = (statm_rss - statm_shared) * page_size_kb;
   ws_usage->shared = statm_shared * page_size_kb;
@@ skipping 520 matching lines @@
 #if defined(OS_LINUX)
 int ProcessMetrics::GetIdleWakeupsPerSecond() {
   uint64 wake_ups;
   const char kWakeupStat[] = "se.statistics.nr_wakeups";
   return ReadProcSchedAndGetFieldAsUint64(process_, kWakeupStat, &wake_ups) ?
       CalculateIdleWakeupsPerSecond(wake_ups) : 0;
 }
 #endif  // defined(OS_LINUX)
 
 }  // namespace base