Bug 1638105: Remove obsolete assumeThat statement from ContentDelegateTest; r=geckoview-reviewers,agi

This is no longer necessary now that we've gotten rid of the `aww_crap_handler`
stuff in x86 debug builds.

Differential Revision: https://phabricator.services.mozilla.com/D75400

mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/ContentDelegateTest.kt

@@ -140,8 +140,6 @@ class ContentDelegateTest : BaseSessionTest() {
     @IgnoreCrash
     @Test fun killContent() {
         assumeThat(sessionRule.env.isMultiprocess, equalTo(true))
-        assumeThat(sessionRule.env.isDebugBuild && sessionRule.env.isX86,
-                equalTo(false))
 
         killAllContentProcesses()
         mainSession.waitUntilCalled(object : Callbacks.ContentDelegate {