Remove exec_ctx from slice and slice buffer

src/core/lib/slice/slice.cc

@@ -68,10 +68,7 @@ grpc_slice grpc_slice_ref(grpc_slice slice) {
 }
 
 /* Public API */
-void grpc_slice_unref(grpc_slice slice) {
-  grpc_core::ExecCtx exec_ctx;
-  grpc_slice_unref_internal(slice);
-}
+void grpc_slice_unref(grpc_slice slice) { grpc_slice_unref_internal(slice); }
 
 /* grpc_slice_from_static_string support structure - a refcount that does
    nothing */

src/core/lib/slice/slice_buffer.cc

@@ -75,7 +75,6 @@ void grpc_slice_buffer_destroy_internal(grpc_slice_buffer* sb) {
 }
 
 void grpc_slice_buffer_destroy(grpc_slice_buffer* sb) {
-  grpc_core::ExecCtx exec_ctx;
   grpc_slice_buffer_destroy_internal(sb);
 }
 
@@ -176,7 +175,6 @@ void grpc_slice_buffer_reset_and_unref_internal(grpc_slice_buffer* sb) {
 }
 
 void grpc_slice_buffer_reset_and_unref(grpc_slice_buffer* sb) {
-  grpc_core::ExecCtx exec_ctx;
   grpc_slice_buffer_reset_and_unref_internal(sb);
 }