tools/gn: rename char_offset to column_number

tools/gn/header_checker.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 "tools/gn/header_checker.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
@@ skipping 45 matching lines @@
   InputFile* clone_input_file;
   std::vector<Token>* tokens;  // Don't care about this.
   scoped_ptr<ParseNode>* parse_root;  // Don't care about this.
 
   g_scheduler->input_file_manager()->AddDynamicInput(
       input_file.name(), &clone_input_file, &tokens, &parse_root);
   clone_input_file->SetContents(input_file.contents());
 
   return LocationRange(Location(clone_input_file,
                                 range.begin().line_number(),
-                                range.begin().char_offset(),
+                                range.begin().column_number(),
                                 -1 /* TODO(scottmg) */),
                        Location(clone_input_file,
                                 range.end().line_number(),
-                                range.end().char_offset(),
+                                range.end().column_number(),
                                 -1 /* TODO(scottmg) */));
 }
 
 // Given a reverse dependency chain where the target chain[0]'s includes are
 // being used by chain[end] and not all deps are public, returns the string
 // describing the error.
 std::string GetDependencyChainPublicError(
     const HeaderChecker::Chain& chain) {
   std::string ret = "The target:\n  " +
       chain[chain.size() - 1].target->label().GetUserVisibleName(false) +
@@ skipping 496 matching lines @@
   if (targets_with_other_toolchains.size() +
       targets_with_matching_toolchains.size() > 1)
     msg += "at least one of ";
   msg += "which should somehow be reachable.";
 
   // Danger: must call CreatePersistentRange to put in Err.
   return Err(CreatePersistentRange(source_file, range),
              "Include not allowed.", msg);
 }