[Telemetry] Use 'RunPageInteractions' for OilpanGCTimesForInternals & OilpanGCTimesForBlinkerPerf.
There is no need to change oilpan benchmark because the pages that
are used with these 2 tests do not do any actions in RunPageInteractions.
(see https://code.google.com/p/chromium/codesearch#chromium/src/tools/perf/benchmarks/oilpan_gc_times.py&l=26)
measurement_smoke_test failed to catch these two page tests because it used
index by module name instead of index by class name.
Update measurement_smoke_test to use index by class name.
BUG=418375
Review URL: https://codereview.chromium.org/
1001163003
Cr-Commit-Position: refs/heads/master@{#320461}