Increase the regression trigger size for  xp_release chrome.dll by 18kB
Increase the regression trigger size for  xp_release chrome.dll by 18kB

sjl's CL 91771 added a bunch of new png images (total size ~ 90kB), which
triggered the size regression (chrome.dll). 

His new CL 91875 cut down the delta to 24k, but it's still over the previous
regression limit. Because we have to take this hit for a better video
player, I'm updating the regression criterion by 12k. 

BUG=NONE
TEST=No more Windows size regression (chrome.dll)
TBR=cmp
Review URL: http://codereview.chromium.org/7327021

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@91891 0039d316-1c4b-4281-b951-d872f2087c98

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