Change registration for ContentLayer => TiledLayer
Change registration for ContentLayer => TiledLayer

This will match the change in https://codereview.chromium.org/14607017/

R=dsinclair@chromium.org
BUG=none

Review URL: https://codereview.appspot.com/9207046
danbeam/catapult,SummerLW/Perf-Insight-Report,danbeam/catapult,0x90sled/catapult,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,sahiljain/catapult,benschmaus/catapult,catapult-project/catapult,benschmaus/catapult,dstockwell/catapult,modulexcite/catapult,benschmaus/catapult,zeptonaut/catapult,sahiljain/catapult,SummerLW/Perf-Insight-Report,benschmaus/catapult,scottmcmaster/catapult,zeptonaut/catapult,vmpstr/trace-viewer,modulexcite/catapult,scottmcmaster/catapult,catapult-project/catapult-csm,modulexcite/catapult,SummerLW/Perf-Insight-Report,dstockwell/catapult,catapult-project/catapult-csm,catapult-project/catapult-csm,vmpstr/trace-viewer,catapult-project/catapult,scottmcmaster/catapult,danbeam/catapult,catapult-project/catapult-csm,SummerLW/Perf-Insight-Report,sahiljain/catapult,benschmaus/catapult,sahiljain/catapult,catapult-project/catapult,benschmaus/catapult,catapult-project/catapult-csm,sahiljain/catapult,0x90sled/catapult,0x90sled/catapult,SummerLW/Perf-Insight-Report,vmpstr/trace-viewer,sahiljain/catapult,catapult-project/catapult,SummerLW/Perf-Insight-Report,zeptonaut/catapult,dstockwell/catapult,danbeam/catapult,dstockwell/catapult,catapult-project/catapult,catapult-project/catapult