Also modifying include in the repo which points to sparse_histogram.h to histogram_macros.h

All changes to file not in base/metrics is for using histogram_macros.h instead of sparse_histogram.h

We are doing this to consolidate header files and cleanup base/metrics externally usable histogram macros.

BUG=650371
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
TBR=bartfab@chromium.org,mad@chromium.org,rogerta@chromium.org,gab@chromium.org,boliu@chromium.org,estade@chromium.org,juliatuttle@chromium.org,vmiura@chromium.org,dewittj@chromium.org,hajimehoshi@chromium.org,ncarter@chromium.orgsvaldez@chromium.org,pkasting@chromium.org,sehr@chromium.org,mkwst@chromium.org,treib@chromium.org,marcheu@chromium.org,zea@chromium.org,kinaba@chromium.org,torne@chromium.org,mtomasz@chromium.org,ccameron@chromium.org,eugenebut@chromium.org,dimich@chromium.org,mcasas@chromium.org,mek@chromium.org,agl@chromium.org

Review-Url: https://chromiumcodereview.appspot.com/2373523003
Cr-Commit-Position: refs/heads/master@{#426131}