Remove build & test configs for chromeos-amd64-generic-google-rel.

Removing the builder since it's not providing anything that
chromeos-betty-google-rel isn't.

Change-Id: I7841e41585cc5e814dde37141145834f94792431
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884521Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711064}

testing/buildbot/chrome.json

 {
   "AAAAA1 AUTOGENERATED FILE DO NOT EDIT": {},
   "AAAAA2 See generate_buildbot_json.py to make changes": {},
-  "chromeos-amd64-generic-google-rel": {
-    "additional_compile_targets": [
-      "chrome"
-    ]
-  },
   "chromeos-betty-google-rel": {
     "additional_compile_targets": [
       "chromiumos_preflight"

testing/buildbot/waterfalls.pyl

@@ -12,11 +12,6 @@
   {
     'name': 'chrome',
     'machines': {
-      'chromeos-amd64-generic-google-rel': {
-        'additional_compile_targets': [
-          'chrome',
-        ],
-      },
       'chromeos-betty-google-rel': {
         'additional_compile_targets': [
           'chromiumos_preflight',

tools/mb/mb_config.pyl

@@ -14,7 +14,6 @@
   # below). MB uses this dict to look up which config to use for a given bot.
   'masters': {
     'chrome': {
-      'chromeos-amd64-generic-google-rel': 'official_cros_chrome_sdk',
       'chromeos-betty-google-rel': 'official_cros_chrome_sdk_headless_ozone',
       'chromeos-betty-pi-arc-google-rel': 'official_cros_chrome_sdk_headless_ozone',
       'chromeos-eve-google-rel': 'official_cros_chrome_sdk_headless_ozone',