Rename GN tool's deps to depsformat.

tools/gn/toolchain.h

 // 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.
 
 #ifndef TOOLS_GN_TOOLCHAIN_H_
 #define TOOLS_GN_TOOLCHAIN_H_
 
 #include "base/compiler_specific.h"
 #include "base/strings/string_piece.h"
 #include "tools/gn/item.h"
@@ skipping 43 matching lines @@
   static const char* kToolLink;
   static const char* kToolStamp;
   static const char* kToolCopy;
 
   struct Tool {
     Tool();
     ~Tool();
 
     std::string command;
     std::string depfile;
-    std::string deps;
+    std::string depsformat;
     std::string description;
     std::string lib_dir_prefix;
     std::string lib_prefix;
     std::string pool;
     std::string restat;
     std::string rspfile;
     std::string rspfile_content;
   };
 
   Toolchain(const Settings* settings, const Label& label);
@@ skipping 22 matching lines @@
   const Scope::KeyValueMap& args() const { return args_; }
 
  private:
   Tool tools_[TYPE_NUMTYPES];
 
   LabelTargetVector deps_;
   Scope::KeyValueMap args_;
 };
 
 #endif  // TOOLS_GN_TOOLCHAIN_H_