MallocBench: removed the --measure-heap option

MallocBench: removed the --measure-heap option
https://bugs.webkit.org/show_bug.cgi?id=131854

Reviewed by Sam Weinig.

As of <https://bugs.webkit.org/show_bug.cgi?id=131661>, measuring the
heap is fast, so there's no reason to disable it.

* MallocBench/MallocBench/Benchmark.cpp:
(Benchmark::Benchmark):
(Benchmark::run):
(Benchmark::printReport):
* MallocBench/MallocBench/Benchmark.h:
* MallocBench/MallocBench/CommandLine.cpp:
(CommandLine::printUsage):
* MallocBench/MallocBench/CommandLine.h:
(CommandLine::heapSize):
(CommandLine::measureHeap): Deleted.
* MallocBench/MallocBench/main.cpp:
(main):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@167505 268f45cc-cd09-0410-ab3c-d52691b4dbfc