Fix bug.

src/cpp/common/channel_filter.h

@@ -244,7 +244,7 @@ class CallData {
 
   /// Initializes the call data.
   virtual grpc_error *Init(grpc_exec_ctx *exec_ctx, ChannelData *channel_data,
-                           grpc_channel_element_args *args) {
+                           grpc_call_element_args *args) {
     return GRPC_ERROR_NONE;
   }
 

test/cpp/common/channel_filter_test.cc

@@ -43,7 +43,8 @@ class MyChannelData : public ChannelData {
  public:
   MyChannelData() {}
 
-  grpc_error *Init(grpc_exec_ctx *exec_ctx, grpc_channel_element_args *args) {
+  grpc_error *Init(grpc_exec_ctx *exec_ctx, grpc_channel_element_args *args)
+      override {
     (void)args->channel_args;  // Make sure field is available.
     return GRPC_ERROR_NONE;
   }
@@ -54,7 +55,7 @@ class MyCallData : public CallData {
   MyCallData() {}
 
   grpc_error *Init(grpc_exec_ctx *exec_ctx, ChannelData *channel_data,
-                   grpc_call_element_args *args) {
+                   grpc_call_element_args *args) override {
     (void)args->path;  // Make sure field is available.
     return GRPC_ERROR_NONE;
   }