gn: Use the term 'out_dir' consistently when referring to the output directory.

tools/gn/command_refs.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 <map>
 #include <set>
 
 #include "base/command_line.h"
 #include "tools/gn/commands.h"
 #include "tools/gn/deps_iterator.h"
@@ skipping 186 matching lines @@
       matches->push_back(target);
   }
 }
 
 }  // namespace
 
 const char kRefs[] = "refs";
 const char kRefs_HelpShort[] =
     "refs: Find stuff referencing a target or file.";
 const char kRefs_Help[] =
-    "gn refs <build_dir> (<label_pattern>|<file>) [--files] [--tree] [--all]\n"
+    "gn refs <out_dir> (<label_pattern>|<file>) [--files] [--tree] [--all]\n"
     "        [--all-toolchains]\n"
     "\n"
     "  Finds reverse dependencies (which targets reference something). The\n"
     "  input is either a target label, a target label pattern, or a file\n"
     "  name.\n"
     "\n"
     "  The <label_pattern> can take exact labels or patterns that match more\n"
     "  than one (although not general regular expressions).\n"
     "  See \"gn help label_pattern\" for details.\n"
     "\n"
@@ skipping 57 matching lines @@
     "      Display a reverse dependency tree to get to the given file. This\n"
     "      will show how dependencies will reference that file.\n"
     "\n"
     "  gn refs out/Debug //base/macros.h --all\n"
     "      Display all unique targets with some dependency path to a target\n"
     "      containing the given file as a source.\n";
 
 int RunRefs(const std::vector<std::string>& args) {
   if (args.size() != 2) {
     Err(Location(), "You're holding it wrong.",
-        "Usage: \"gn refs <build_dir> (<label_pattern>|<file>)\"")
+        "Usage: \"gn refs <out_dir> (<label_pattern>|<file>)\"")
         .PrintToStdout();
     return 1;
   }
 
   const base::CommandLine* cmdline = base::CommandLine::ForCurrentProcess();
   bool tree = cmdline->HasSwitch("tree");
   bool all = cmdline->HasSwitch("all");
   bool all_toolchains = cmdline->HasSwitch("all-toolchains");
   bool files = cmdline->HasSwitch("files");
 
@@ skipping 82 matching lines @@
           results.insert(cur_dep->second);
       }
     }
     OutputResultSet(results, files);
   }
 
   return 0;
 }
 
 }  // namespace commands