Revert of Update SplitString calls to new form

base/process/process_metrics_linux.cc

Index: base/process/process_metrics_linux.cc
diff --git a/base/process/process_metrics_linux.cc b/base/process/process_metrics_linux.cc
index b282ff0a57a38300ded3b3c8be813ad25a2d2f22..47a79e51e5eb1c92e4b9bdd0cf0244eeb8fc9753 100644
--- a/base/process/process_metrics_linux.cc
+++ b/base/process/process_metrics_linux.cc
@@ -67,8 +67,8 @@
     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;
@@ -368,8 +368,8 @@
       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.