Revert "[Fuchsia] Enable cc_unittests on Fuchsia x64 CI bot."

This reverts commit 96fb1b2a174a418547d61043efd3bb25bb42972a.

Reason for revert: This suite encounters some kind of networking flake in roughly 20% of runs.

Original change's description:
> [Fuchsia] Enable cc_unittests on Fuchsia x64 CI bot.
> 
> Adds about 2-3 minutes of bot time per test run.
> 
> Bug: 1046552
> Change-Id: I3cc46ce2769dc2b64e6d966a4eb4c5ed2737070c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2157545
> Reviewed-by: Brian Sheedy <[email protected]>
> Commit-Queue: Chong Gu <[email protected]>
> Cr-Commit-Position: refs/heads/master@{#760636}

[email protected],[email protected]

Change-Id: I36856633ebf26196728f2a85e21e5f61558b44f7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1046552
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159221
Reviewed-by: Wez <[email protected]>
Commit-Queue: Wez <[email protected]>
Cr-Commit-Position: refs/heads/master@{#760926}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 2731bada..6af3315 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -590,6 +590,7 @@
     },
     'remove_from': [
       'Fuchsia ARM64', # https://crbug.com/1046552
+      'Fuchsia x64', # https://crbug.com/1046552
       'fuchsia-fyi-arm64-rel',
     ],
   },