Fixing windows build.
Fixing windows build.

"src\store-buffer.cc(72) : warning C4244: 'initializing' : conversion from 'intptr_t' to 'int', possible loss of data"

Review URL: http://codereview.chromium.org/8804003

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@10146 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh