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Currently MSVC builder cannot build v8 and pdfium with cl.exe.

TBR=dpranke@chromium.org, thakis@chromium.org

Change-Id: Ic7fc3bd57583f33f56a795e1534e5c04774c6612
Reviewed-on: https://chromium-review.googlesource.com/1152645Reviewed-by: Fumitoshi Ukai <ukai@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578584}