Fixes warm-start performance on Vista and Win7 when using pre-reading optimization. Avg times go from ~500ms to ~300ms.
Fixes warm-start performance on Vista and Win7 when using pre-reading optimization. Avg times go from ~500ms to ~300ms.

TEST=run chrome_frame_perftests.exe --gtest_filter=*X.PerfWarm on Vista/Win7 and XP. Note that warm starts are now faster on Vista and unchanged on XP.
BUG=45510

Review URL: http://codereview.chromium.org/3058023

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@54934 0039d316-1c4b-4281-b951-d872f2087c98

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