Fixes a build break caused by r10178. r10178 compares an int value 'written' with a size_t value 'sizeof(num_open_files)' in "base/process_util_unittest.cc" and it caused a compilation error on Mac and Linux. As a quick fix, this change casts the int value 'written' to size_t.
Fixes a build break caused by r10178.
r10178 compares an int value 'written' with a size_t value 'sizeof(num_open_files)' in "base/process_util_unittest.cc" and it caused a compilation error on Mac and Linux.
As a quick fix, this change casts the int value 'written' to size_t.

TBR=xji
Review URL: http://codereview.chromium.org/28019

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@10179 0039d316-1c4b-4281-b951-d872f2087c98

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