Remove remaining legacy SplitString calls.

chromeos/system/version_loader.cc

Index: chromeos/system/version_loader.cc
diff --git a/chromeos/system/version_loader.cc b/chromeos/system/version_loader.cc
index a5604d8f16d176160598ea8d3adcce314bfb2766..ab9505b6274f27040faa0a60f6764ffd5bedb42f 100644
--- a/chromeos/system/version_loader.cc
+++ b/chromeos/system/version_loader.cc
@@ -75,12 +75,12 @@ std::string ParseFirmware(const std::string& contents) {
   //   fixed. So we just match kFirmwarePrefix at the start of the line and find
   //   the first character that is not "|" or space
 
-  std::vector<std::string> lines;
-  base::SplitString(contents, '\n', &lines);
-  for (size_t i = 0; i < lines.size(); ++i) {
-    if (base::StartsWith(lines[i], kFirmwarePrefix,
+  base::StringPiece firmware_prefix(kFirmwarePrefix);
+  for (const std::string& line : base::SplitString(
+           contents, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
+    if (base::StartsWith(line, firmware_prefix,
                          base::CompareCase::INSENSITIVE_ASCII)) {
-      std::string str = lines[i].substr(std::string(kFirmwarePrefix).size());
+      std::string str = line.substr(firmware_prefix.size());
       size_t found = str.find_first_not_of("| ");
       if (found != std::string::npos)
         return str.substr(found);