Move Win x64 clobber bot and remove Win x64 GN bots.

scripts/slave/recipes/chromium.expected/full_chromium_Win_x64.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\kill_processes.py"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "taskkill"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]\\resources\\bot_update.py",
       "--master",
       "chromium",
       "--builder",
-      "Win",
+      "Win x64",
       "--slave",
       "TestSlavename",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'custom_vars': {'googlecode_url': 'svn://svn-mirror.golo.chromium.org/%s', 'nacl_trunk': 'svn://svn-mirror.golo.chromium.org/native_client/trunk', 'sourceforge_url': 'svn://svn-mirror.golo.chromium.org/%(repo)s', 'webkit_trunk': 'svn://svn-mirror.golo.chromium.org/blink/trunk'}, 'deps_file': 'DEPS', 'managed': True, 'name': 'src', 'url': 'svn://svn-mirror.golo.chromium.org/chrome/trunk/src'}]",
       "--root",
       "src",
       "--revision_mapping_file",
       "{\"src\": \"got_revision\", \"src/native_client\": \"got_nacl_revision\", \"src/third_party/angle\": \"got_angle_revision\", \"src/third_party/webrtc\": \"got_webrtc_revision\", \"src/tools/swarming_client\": \"got_swarming_client_revision\", \"src/v8\": \"got_v8_revision\"}",
       "--git-cache-dir",
       "[GIT_CACHE]",
@@ skipping 80 matching lines @@
     "cmd": [],
     "cwd": "[SLAVE_BUILD]",
     "name": "ensure_goma"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::cipd]\\resources\\bootstrap.py",
       "--platform",
-      "windows-386",
+      "windows-amd64",
       "--dest-directory",
       "[SLAVE_BUILD]\\cipd",
       "--json-output",
       "/path/to/tmp/json"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "ensure_goma.install cipd",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@STEP_TEXT@cipd instance_id: 40-chars-fake-of-the-package-instance_id@@@",
@@ skipping 34 matching lines @@
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]\\gclient.py",
       "runhooks"
     ],
     "cwd": "[SLAVE_BUILD]",
     "env": {
-      "GYP_DEFINES": "chromium_win_pch=0 component=static_library fastbuild=1 gomadir='[CACHE]\\cipd\\goma' linux_dump_symbols=0 target_arch=ia32 test_isolation_mode=noop use_goma=1",
+      "GYP_DEFINES": "chromium_win_pch=0 component=static_library fastbuild=1 gomadir='[CACHE]\\cipd\\goma' linux_dump_symbols=0 target_arch=x64 test_isolation_mode=noop use_goma=1",
       "PATH": "%(PATH)s;RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[SLAVE_BUILD]\\src\\testing\\scripts\\get_compile_targets.py",
       "--output",
       "/path/to/tmp/json",
       "--",
       "--build-config-fs",
-      "Release",
+      "Release_x64",
       "--paths",
       "{\"checkout\": \"[SLAVE_BUILD]\\\\src\", \"runit.py\": \"RECIPE_PACKAGE_REPO[build]\\\\scripts\\\\tools\\\\runit.py\", \"runtest.py\": \"RECIPE_PACKAGE_REPO[build]\\\\scripts\\\\slave\\\\runtest.py\"}",
       "--properties",
-      "{\"buildername\": \"Win\", \"buildnumber\": 571, \"mastername\": \"chromium\", \"slavename\": \"TestSlavename\", \"target_platform\": \"win\"}"
+      "{\"buildername\": \"Win x64\", \"buildnumber\": 571, \"mastername\": \"chromium\", \"slavename\": \"TestSlavename\", \"target_platform\": \"win\"}"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "get compile targets for scripts",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
@@ skipping 29 matching lines @@
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\tools\\runit.py",
       "--show-path",
       "python",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\compile.py",
       "--gsutil-py-path",
       "RECIPE_PACKAGE_REPO[depot_tools]\\gsutil.py",
       "--ninja-path",
       "RECIPE_PACKAGE_REPO[depot_tools]\\ninja.exe",
       "--target",
-      "Release",
+      "Release_x64",
       "--src-dir",
       "[SLAVE_BUILD]\\src",
       "--goma-cache-dir",
       "[GOMA_CACHE]",
       "--build-tool",
       "ninja",
       "--build-data-dir",
       "[ROOT]\\build_data_dir",
       "--compiler",
       "goma",
@@ skipping 16 matching lines @@
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\chromium\\archive_build.py",
       "--target",
       "Release",
       "--factory-properties",
-      "{\"gclient_env\": {\"GYP_DEFINES\": \"chromium_win_pch=0 component=static_library fastbuild=1 gomadir='[CACHE]\\\\cipd\\\\goma' linux_dump_symbols=0 target_arch=ia32 test_isolation_mode=noop use_goma=1\"}, \"gs_acl\": \"public-read\", \"gs_bucket\": \"gs://chromium-browser-snapshots\"}",
+      "{\"gclient_env\": {\"GYP_DEFINES\": \"chromium_win_pch=0 component=static_library fastbuild=1 gomadir='[CACHE]\\\\cipd\\\\goma' linux_dump_symbols=0 target_arch=x64 test_isolation_mode=noop use_goma=1\"}, \"gs_acl\": \"public-read\", \"gs_bucket\": \"gs://chromium-browser-snapshots\"}",
       "--build-properties",
       "{\"got_angle_revision\": \"fac9503c46405f77757b9a728eb85b8d7bc6080c\", \"got_angle_revision_cp\": \"refs/heads/master@{#297276}\", \"got_nacl_revision\": \"d998e125e8253980d76e269b7982aeeefc1b9b50\", \"got_nacl_revision_cp\": \"refs/heads/master@{#274981}\", \"got_revision\": \"f27fede2220bcd326aee3e86ddfd4ebd0fe58cb9\", \"got_revision_cp\": \"refs/heads/master@{#170242}\", \"got_swarming_client_revision\": \"a0ee5d99f1d4b38ddaa4c759c837980b63b99566\", \"got_swarming_client_revision_cp\": \"refs/heads/master@{#276089}\", \"got_v8_revision\": \"801ada225ddc271c132c3a35f03975671d43e399\", \"got_v8_revision_cp\": \"refs/heads/master@{#43426}\", \"got_webrtc_revision\": \"0f90628433546e61d9268596da93418c623137f4\", \"got_webrtc_revision_cp\": \"refs/heads/master@{#120644}\"}",
       "--mode",
       "dev"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "archive_build"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]