Remove remaining legacy SplitString calls.

tools/gn/command_format.cc

 // Copyright 2014 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 <sstream>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/strings/string_split.h"
 #include "tools/gn/commands.h"
@@ skipping 62 matching lines @@
   kPrecedenceAssign,
   kPrecedenceOr,
   kPrecedenceAnd,
   kPrecedenceCompare,
   kPrecedenceAdd,
   kPrecedenceUnary,
   kPrecedenceSuffix,
 };
 
 int CountLines(const std::string& str) {
-  std::vector<std::string> lines;
-  base::SplitStringDontTrim(str, '\n', &lines);
-  return static_cast<int>(lines.size());
+  return static_cast<int>(base::SplitStringPiece(
+      str, "\n", base::KEEP_WHITESPACE, base::SPLIT_WANT_ALL).size());
 }
 
 class Printer {
  public:
   Printer();
   ~Printer();
 
   void Block(const ParseNode* file);
 
   std::string String() const { return output_; }
@@ skipping 291 matching lines @@
   if (block->comments()) {
     for (const auto& c : block->comments()->after()) {
       TrimAndPrintToken(c);
       Newline();
     }
   }
 }
 
 int Printer::AssessPenalty(const std::string& output) {
   int penalty = 0;
-  std::vector<std::string> lines;
-  base::SplitStringDontTrim(output, '\n', &lines);
+  std::vector<std::string> lines = base::SplitString(
+      output, "\n", base::KEEP_WHITESPACE, base::SPLIT_WANT_ALL);
   penalty += static_cast<int>(lines.size() - 1) * GetPenaltyForLineBreak();
   for (const auto& line : lines) {
     if (line.size() > kMaximumWidth)
       penalty += static_cast<int>(line.size() - kMaximumWidth) * kPenaltyExcess;
   }
   return penalty;
 }
 
 bool Printer::ExceedsMaximumWidth(const std::string& output) {
-  std::vector<std::string> lines;
-  base::SplitStringDontTrim(output, '\n', &lines);
-  for (const auto& line : lines) {
+  for (const auto& line : base::SplitString(
+           output, "\n", base::KEEP_WHITESPACE, base::SPLIT_WANT_ALL)) {
     if (line.size() > kMaximumWidth)
       return true;
   }
   return false;
 }
 
 void Printer::AddParen(int prec, int outer_prec, bool* parenthesized) {
   if (prec < outer_prec) {
     Print("(");
     *parenthesized = true;
@@ skipping 626 matching lines @@
       }
     } else {
       printf("%s", output_string.c_str());
     }
   }
 
   return 0;
 }
 
 }  // namespace commands