Remove obsolete coverage code.

This code has not been used as it is extremelly slow. We are removing it
from the repository.

Change-Id: I01172a31bca38f2c0247131753de99f21b1ea7dc
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/12600
Reviewed-by: Yusuf Mohsinally <mohsinally@google.com>
Commit-Queue: Godofredo Contreras <godofredoc@google.com>

recipe_modules/adhoc_validation/api.py

diff --git a/recipe_modules/adhoc_validation/api.py b/recipe_modules/adhoc_validation/api.py
index 5adcac1..4801578 100644
--- a/recipe_modules/adhoc_validation/api.py
+++ b/recipe_modules/adhoc_validation/api.py
@@ -17,7 +17,7 @@
     """Returns the list of accepted validations."""
     return [
         'analyze', 'customer_testing', 'docs', 'fuchsia_precache',
-        'tool_coverage', 'web_e2e_test', 'web_smoke_test',
+        'web_e2e_test', 'web_smoke_test',
         'verify_binaries_codesigned', 'validate_ci_config',
     ]
 

recipe_modules/adhoc_validation/resources/tool_coverage.sh

diff --git a/recipe_modules/adhoc_validation/resources/tool_coverage.sh b/recipe_modules/adhoc_validation/resources/tool_coverage.sh
deleted file mode 100644
index 0166064..0000000
--- a/recipe_modules/adhoc_validation/resources/tool_coverage.sh
+++ /dev/null
@@ -1,12 +0,0 @@
-#!/bin/bash
-
-# Copyright 2020 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-set -e
-
-export SHARD=tool_coverage
-dart --enable-asserts ./dev/bots/test.dart
-token=`cat $CODECOV`
-bash <(curl -s https://codecov.io/bash) -c -f packages/flutter_tools/coverage/lcov.info -t $token -F flutter_tool