Reverting pb.c files for now. Also fixing few more build errors
diff --git a/grpc.gemspec b/grpc.gemspec
index dc441c7..98bdbe1 100644
--- a/grpc.gemspec
+++ b/grpc.gemspec
@@ -631,7 +631,7 @@
   s.files += %w( src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_channel_secure.cc )
   s.files += %w( src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_client_stats.cc )
   s.files += %w( src/core/ext/filters/client_channel/lb_policy/grpclb/load_balancer_api.cc )
-  s.files += %w( src/core/ext/filters/client_channel/lb_policy/grpclb/proto/grpc/lb/v1/load_balancer.pb.cc )
+  s.files += %w( src/core/ext/filters/client_channel/lb_policy/grpclb/proto/grpc/lb/v1/load_balancer.pb.c )
   s.files += %w( third_party/nanopb/pb_common.c )
   s.files += %w( third_party/nanopb/pb_decode.c )
   s.files += %w( third_party/nanopb/pb_encode.c )
@@ -648,8 +648,8 @@
   s.files += %w( src/core/ext/filters/load_reporting/server_load_reporting_plugin.cc )
   s.files += %w( src/core/ext/census/base_resources.cc )
   s.files += %w( src/core/ext/census/context.cc )
-  s.files += %w( src/core/ext/census/gen/census.pb.cc )
-  s.files += %w( src/core/ext/census/gen/trace_context.pb.cc )
+  s.files += %w( src/core/ext/census/gen/census.pb.c )
+  s.files += %w( src/core/ext/census/gen/trace_context.pb.c )
   s.files += %w( src/core/ext/census/grpc_context.cc )
   s.files += %w( src/core/ext/census/grpc_filter.cc )
   s.files += %w( src/core/ext/census/grpc_plugin.cc )