GN: Complete static libs can't depend on static libs

tools/gn/target.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_TARGET_H_
 #define TOOLS_GN_TARGET_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 226 matching lines @@
   void PullForwardedDependentConfigs();
   void PullForwardedDependentConfigsFrom(const Target* from);
   void PullRecursiveHardDeps();
 
   // Fills the link and dependency output files when a target is resolved.
   void FillOutputFiles();
 
   // Validates the given thing when a target is resolved.
   bool CheckVisibility(Err* err) const;
   bool CheckTestonly(Err* err) const;
+  bool CheckNoNestedStaticLibs(Err* err) const;
 
   OutputType output_type_;
   std::string output_name_;
   std::string output_extension_;
 
   FileList sources_;
   bool all_headers_public_;
   FileList public_headers_;
   bool check_includes_;
   bool complete_static_lib_;
@@ skipping 55 matching lines @@
 };
 #elif defined(COMPILER_MSVC)
 inline size_t hash_value(const Target* t) {
   return reinterpret_cast<size_t>(t);
 }
 #endif  // COMPILER...
 
 }  // namespace BASE_HASH_NAMESPACE
 
 #endif  // TOOLS_GN_TARGET_H_