Reverting pb.c files for now. Also fixing few more build errors
diff --git a/gRPC-Core.podspec b/gRPC-Core.podspec
index 4f7b00d..e831058 100644
--- a/gRPC-Core.podspec
+++ b/gRPC-Core.podspec
@@ -694,7 +694,7 @@
                       'src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_channel_secure.cc',
                       'src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_client_stats.cc',
                       'src/core/ext/filters/client_channel/lb_policy/grpclb/load_balancer_api.cc',
-                      'src/core/ext/filters/client_channel/lb_policy/grpclb/proto/grpc/lb/v1/load_balancer.pb.cc',
+                      'src/core/ext/filters/client_channel/lb_policy/grpclb/proto/grpc/lb/v1/load_balancer.pb.c',
                       'src/core/ext/filters/client_channel/resolver/fake/fake_resolver.cc',
                       'src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc',
                       'src/core/ext/filters/client_channel/lb_policy/round_robin/round_robin.cc',
@@ -708,8 +708,8 @@
                       'src/core/ext/filters/load_reporting/server_load_reporting_plugin.cc',
                       'src/core/ext/census/base_resources.cc',
                       'src/core/ext/census/context.cc',
-                      'src/core/ext/census/gen/census.pb.cc',
-                      'src/core/ext/census/gen/trace_context.pb.cc',
+                      'src/core/ext/census/gen/census.pb.c',
+                      'src/core/ext/census/gen/trace_context.pb.c',
                       'src/core/ext/census/grpc_context.cc',
                       'src/core/ext/census/grpc_filter.cc',
                       'src/core/ext/census/grpc_plugin.cc',