Bug 1513880 [wpt PR 14496] - Revert "Make testharness tests run in a …

…top-level browsing context", a=testonly

Automatic update from web-platform-tests
Revert "Make testharness tests run in a top-level browsing context" (#14496)

This reverts commit 74522a275bea481821e789145578e9e16fd27be3.

Fixes web-platform-tests/wpt#14495.

Reopens web-platform-tests/wpt#13418.
--

wpt-commits: 9377b490049c9af88ea0261ad3b92757733e8e95
wpt-pr: 14496

UltraBlame original commit: 0f0edff319bf9938e6ce47e62c586d2f25919263

testing/web-platform/tests/tools/wptrunner/wptrunner/browsers/base.py

@@ -93,9 +93,6 @@
 "
 env_options
 "
-"
-timeout_multiplier
-"
 )
 :
 
@@ -539,39 +536,6 @@
 (
 )
 def
-get_timeout_multiplier
-(
-test_type
-run_info_data
-*
-*
-kwargs
-)
-:
-
-if
-kwargs
-[
-"
-timeout_multiplier
-"
-]
-is
-not
-None
-:
-
-return
-kwargs
-[
-"
-timeout_multiplier
-"
-]
-
-return
-1
-def
 browser_command
 (
 binary