use calculated xcode version for mac_upload_clang

mac_upload_clang had set static version of xcode to use. This
change removes these static properties such that it uses a version
of xcode calculated from the OS in the osx_sdk recipe module.

Bug: 1137520
Change-Id: Ia184c03abad326656989402655645938437d37e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468236
Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816614}

infra/config/generated/cr-buildbucket.cfg

@@ -27946,17 +27946,13 @@ buckets {
         cipd_version: "refs/heads/master"
         cmd: "recipes"
       }
-      properties: "{\"$build/goma\":{\"use_luci_auth\":true},\"$depot_tools/osx_sdk\":{\"sdk_version\":\"9a235\"},\"$kitchen\":{\"devshell\":true,\"git_auth\":true},\"$recipe_engine/isolated\":{\"server\":\"https://isolateserver.appspot.com\"},\"builder_group\":\"tryserver.chromium.mac\",\"recipe\":\"chromium_upload_clang\"}"
+      properties: "{\"$build/goma\":{\"use_luci_auth\":true},\"$kitchen\":{\"devshell\":true,\"git_auth\":true},\"$recipe_engine/isolated\":{\"server\":\"https://isolateserver.appspot.com\"},\"builder_group\":\"tryserver.chromium.mac\",\"recipe\":\"chromium_upload_clang\"}"
       execution_timeout_secs: 21600
       expiration_secs: 7200
       caches {
         name: "win_toolchain"
         path: "win_toolchain"
       }
-      caches {
-        name: "xcode_mac_9a235"
-        path: "xcode_mac_9a235.app"
-      }
       build_numbers: YES
       service_account: "chromium-try-builder@chops-service-accounts.iam.gserviceaccount.com"
       task_template_canary_percentage {

infra/config/subprojects/chromium/try.star

@@ -1198,20 +1198,9 @@ try_.chromium_mac_builder(
 try_.chromium_mac_builder(
     name = "mac_upload_clang",
     builderless = False,
-    caches = [
-        swarming.cache(
-            name = "xcode_mac_9a235",
-            path = "xcode_mac_9a235.app",
-        ),
-    ],
     executable = "recipe:chromium_upload_clang",
     execution_timeout = 6 * time.hour,
     goma_backend = None,  # Does not use Goma.
-    properties = {
-        "$depot_tools/osx_sdk": {
-            "sdk_version": "9a235",
-        },
-    },
 )
 
 try_.chromium_mac_ios_builder(