Fix bloom filter to not exceed the max size.
Fix bloom filter to not exceed the max size.

Previously, the constructor overestimated slightly, so could end up
one byte over the kBloomFilterMaxSize.  But other code required never
exceeding that.

BUG=62161
TEST=SB2.BloomFailure shows a drop in FILTER_READ_DATA_MAXSIZE.

Review URL: http://codereview.chromium.org/4584003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@65687 0039d316-1c4b-4281-b951-d872f2087c98

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