GN: don't write separate files for non-binary targets

tools/gn/eclipse_writer.h

 // Copyright 2016 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_ECLIPSE_WRITER_H_
 #define TOOLS_GN_ECLIPSE_WRITER_H_
 
 #include <iosfwd>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 
 class BuildSettings;
 class Builder;
 class Err;
 class Target;
 
 class EclipseWriter {
  public:
   static bool RunAndWriteFile(const BuildSettings* build_settings,
-                              const Builder* builder,
+                              const Builder& builder,
                               Err* err);
 
  private:
   EclipseWriter(const BuildSettings* build_settings,
-                const Builder* builder,
+                const Builder& builder,
                 std::ostream& out);
   ~EclipseWriter();
 
   void Run();
 
   // Populates |include_dirs_| with the include dirs of all the targets for the
   // default toolchain.
   void GetAllIncludeDirs();
 
   // Populates |defines_| with the defines of all the targets for the default
   // toolchain.
   void GetAllDefines();
 
   // Returns true if |target| uses the default toolchain.
   bool UsesDefaultToolchain(const Target* target) const;
 
   // Writes the XML settings file.
   void WriteCDTSettings();
 
   const BuildSettings* build_settings_;
-  const Builder* builder_;
+  const Builder& builder_;
 
   // The output stream for the settings file.
   std::ostream& out_;
 
   // Eclipse languages for which the include dirs and defines apply.
   std::vector<std::string> languages_;
 
   // The include dirs of all the targets which use the default toolchain.
   std::set<std::string> include_dirs_;
 
   // The defines of all the targets which use the default toolchain.
   std::map<std::string, std::string> defines_;
 
   DISALLOW_COPY_AND_ASSIGN(EclipseWriter);
 };
 
 #endif  // TOOLS_GN_ECLIPSE_WRITER_H_