[build] Remove dependency of checkout_aemu variable.

This ports:
https://crrev.com/c/2026424

TBR=mslekova@chromium.org,liviurau@chromium.org

No-Tree-Checks: true
Bug: chromium:1000907
Change-Id: I436baadb8e8357f11a9150c5118c461b03140260
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2030907Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66077}

DEPS

@@ -4,13 +4,9 @@
 
 gclient_gn_args_file = 'v8/build/config/gclient_args.gni'
 gclient_gn_args = [
-  'checkout_aemu'
 ]
 
 vars = {
-  # By Default, do not checkout AEMU, as it is too big, as is done in Chromium.
-  'checkout_aemu': False,
-
   # Fetches only the SDK boot images which match at least one of the whitelist
   # entries in a comma-separated list.
   #
@@ -227,6 +223,26 @@ deps = {
       'condition': 'host_os == "mac" and checkout_fuchsia',
       'dep_type': 'cipd',
   },
+  'v8/third_party/aemu-linux-x64': {
+      'packages': [
+          {
+              'package': 'fuchsia/third_party/aemu/linux-amd64',
+              'version': 'hvClQbzFhJApEEpHpfc8UqpDdzLK0eabIbmpPlfODp8C'
+          },
+      ],
+      'condition': 'host_os == "linux" and checkout_fuchsia',
+      'dep_type': 'cipd',
+  },
+  'v8/third_party/aemu-mac-x64': {
+      'packages': [
+          {
+              'package': 'fuchsia/third_party/aemu/mac-amd64',
+              'version': 'T9bWxf8aUC5TwCFgPxpuW29Mfy-7Z9xCfXB9QO8MfU0C'
+          },
+      ],
+      'condition': 'host_os == "mac" and checkout_fuchsia',
+      'dep_type': 'cipd',
+  },
   'v8/tools/clang':
     Var('chromium_url') + '/chromium/src/tools/clang.git' + '@' + '80ad0bd39053307970cd41341f8d67aecf902bb7',
   'v8/tools/luci-go': {