impl(bigtable): remove deprecated AsyncRowReader header (#15842)

* impl(bigtable): remove deprecated AsyncRowReader header

Author: mpeddada1

doc/v3-migration-guide.md

@@ -104,6 +104,23 @@ for (auto& row : table.ReadRows(
 
 </details>
 
+<details>
+<summary>Removed <code>bigtable::AsyncRowReader<>::NO_ROWS_LIMIT</code>
+</summary>
+
+AsyncRowReader::NO_ROWS_LIMIT has been removed. Please use
+`google::cloud::bigtable::RowReader::NO_ROWS_LIMIT` instead.
+
+```cpp
+// Before
+auto limit = google::cloud::bigtable::AsyncRowReader<>::NO_ROWS_LIMIT;
+
+// After
+auto limit = google::cloud::bigtable::RowReader::NO_ROWS_LIMIT;
+```
+
+</details>
+
 ### Pubsub
 
 ### Spanner

google/cloud/bigtable/CMakeLists.txt

@@ -108,7 +108,6 @@ add_library(
     admin_client.h
     app_profile_config.cc
     app_profile_config.h
-    async_row_reader.h
     bound_query.cc
     bound_query.h
     bytes.cc

google/cloud/bigtable/async_row_reader.h

@@ -47,7 +47,6 @@ google_cloud_cpp_bigtable_hdrs = [
     "admin/internal/bigtable_table_admin_tracing_stub.h",
     "admin_client.h",
     "app_profile_config.h",
-    "async_row_reader.h",
     "bound_query.h",
     "bytes.h",
     "cell.h",