Example failing build: https://ci.chromium.org/buildbot/chromium.chromiumos/linux-chromeos-dbg/5238

The culprit CL should be:
https://chromium-review.googlesource.com/c/chromium/src/+/1003056
hcarmona@, could you take a look? Thanks.

Failure logs:

[14789:14789:0416/165416.563460:ERROR:web_ui_browser_test.cc(477)] JS ERROR: '[14789:14789:0416/165416.557404:ERROR:CONSOLE(197)] "Uncaught (in promise) TypeError: Cannot read property 'requestAvailability' of undefined", source: chrome://extensions/item.js (197)
'
[14789:14789:0416/165416.563489:ERROR:web_ui_browser_test.cc(479)] JS call assumed failed, because JS console error(s) found.
gen/chrome/test/data/webui/extensions/cr_extensions_browsertest-gen.cc:466: Failure
Value of: RunJavascriptTestF( true, "CrExtensionsItemsTest", "ClickableItems")
  Actual: false
Expected: true
Stack trace:
#0 0x000003c49130 StackTraceGetter::CurrentStackTrace()
#1 0x000003c69c87 testing::internal::UnitTestImpl::CurrentOsStackTraceExceptTop()
#2 0x000003c690e2 testing::internal::AssertHelper::operator=()
#3 0x000002de1194 CrExtensionsItemsTest_ClickableItems_Test::RunTestOnMainThread()
#4 0x000007359141 content::BrowserTestBase::ProxyRunTestOnMainThreadLoop()
#5 0x0000009f368d _ZN4base8internal13FunctorTraitsIM25RenderViewContextMenuBaseFvvEvE6InvokeIP21RenderViewContextMenuJEEEvS4_OT_DpOT0_
#6 0x0000009f35d4 _ZN4base8internal12InvokeHelperILb0EvE8MakeItSoIM25RenderViewContextMenuBaseFvvEJP21RenderViewContextMenuEEEvOT_DpOT0_
#7 0x00000735b445 _ZN4base8internal7InvokerINS0_9BindStateIMN7content15BrowserTestBaseEFvvEJNS0_17UnretainedWrapperIS4_EEEEEFvvEE7RunImplIRKS6_RKNSt3__15tupleIJS8_EEEJLm0EEEEvOT_OT0_NSF_16integer_sequenceImJXspT1_EEEE
#8 0x00000735b38c _ZN4base8internal7InvokerINS0_9BindStateIMN7content15BrowserTestBaseEFvvEJNS0_17UnretainedWrapperIS4_EEEEEFvvEE3RunEPNS0_13BindStateBaseE
#9 0x0000009d566d _ZNKR4base17RepeatingCallbackIFvvEE3RunEv
#10 0x000006312d98 ChromeBrowserMainParts::PreMainMessageLoopRunImpl()