[perf] Enable top_10_mobile_memory and top_10_mobile_memory_ignition for mac

Enable top_10_mobile_memory and top_10_mobile_memory_ignition benchmarks on
mac. They were dissabled because the earlier pageset contained google.com
which was being redirected to google.ca. This caused problems with scrolling
action. This cl: https://codereview.chromium.org/2138133003/ updated the
pageset to use google.co.uk to avoid redirection problem. So I am enabling these
benchmarks on mac.

BUG=v8:5019
LOG=N
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.perf:android_s5_perf_cq;master.tryserver.chromium.perf:mac_retina_perf_cq

Review-Url: https://codereview.chromium.org/2170853002
Cr-Commit-Position: refs/heads/master@{#407138}

tools/perf/benchmarks/v8.py

@@ -240,9 +240,6 @@ class _V8MemoryAndCodeSizeBenchmark(perf_benchmark.PerfBenchmark):
 
 
 @benchmark.Disabled('reference')
-# TODO(crbug.com/617814): Temporarily disable this benchmark for mac. Scrolling
-# does not work on for google.com web page. Remove this once it is fixed.
-@benchmark.Disabled('mac')
 class V8MobileCodeSizeIgnition(_V8MemoryAndCodeSizeBenchmark):
   """Measures V8 heap and code size with ignition enabled on mobile web pages.
 
@@ -259,9 +256,6 @@ class V8MobileCodeSizeIgnition(_V8MemoryAndCodeSizeBenchmark):
 
 
 @benchmark.Disabled('reference')
-# TODO(crbug.com/617914): Temporarily disable this benchmark for mac. Scrolling
-# does not work on for google.com web page. Remove this once it is fixed.
-@benchmark.Disabled('mac')
 class V8MobileCodeSize(_V8MemoryAndCodeSizeBenchmark):
   """Measures V8 heap and code size on mobile web pages.