Revert 78333 - Removed "static" in histogram macros. Checking in to see the performance impact.
Revert 78333 - Removed "static" in histogram macros. Checking in to
see the performance impact.

Will revert as soon as performance tests.

BUG=76092
TEST=histogram unit tests
TBR=jar

Review URL: http://codereview.chromium.org/6673074

Review URL: http://codereview.chromium.org/6672037

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@78334 0039d316-1c4b-4281-b951-d872f2087c98

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