Remove HTML import with incorrect path for xhr-element.html.
Remove HTML import with incorrect path for xhr-element.html.

This was accidentally left in in a recent CL, but shouldn't have been.
The correct import for xhr-element is just below.

Review URL: https://codereview.chromium.org/1312903006

sahiljain/catapult,scottmcmaster/catapult,catapult-project/catapult,sahiljain/catapult,scottmcmaster/catapult,benschmaus/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult,SummerLW/Perf-Insight-Report,sahiljain/catapult,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,benschmaus/catapult,benschmaus/catapult,scottmcmaster/catapult,sahiljain/catapult,SummerLW/Perf-Insight-Report,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult-csm,sahiljain/catapult,0x90sled/catapult,catapult-project/catapult-csm,catapult-project/catapult,catapult-project/catapult-csm,benschmaus/catapult,benschmaus/catapult,SummerLW/Perf-Insight-Report,0x90sled/catapult,catapult-project/catapult-csm,catapult-project/catapult,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,benschmaus/catapult,0x90sled/catapult,catapult-project/catapult,benschmaus/catapult,sahiljain/catapult,catapult-project/catapult-csm