Disable generated file check for libs

tools/gn/target.cc

Index: tools/gn/target.cc
diff --git a/tools/gn/target.cc b/tools/gn/target.cc
index 0d275ac93584e1a77c58c2ae00099ee75b5f865b..dfa37ba6e23d55466da4d401de980fb348f715f4 100644
--- a/tools/gn/target.cc
+++ b/tools/gn/target.cc
@@ -552,10 +552,8 @@ void Target::CheckSourcesGenerated() const {
     CheckSourceGenerated(file);
   for (const SourceFile& file : inputs_)
     CheckSourceGenerated(file);
-  for (size_t i = 0; i < all_libs_.size(); i++) {
-    if (all_libs_[i].is_source_file())
-      CheckSourceGenerated(all_libs_[i].source_file());
-  }
+  // TODO(agrieve): Check all_libs_ here as well (those that are source files).
+  // http://crbug.com/571731
 }
 
 void Target::CheckSourceGenerated(const SourceFile& source) const {