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For the following string-valued define:
 defines = [ "CR_CLANG_REVISION=\"$clang_revision\"" ]
this was outputting the following on Windows:
 -D"CR_CLANG_REVISION=\"332838-1\""
The Windows shell can't handle the extra quotes, and so the following
macro was being written:
 #define "CR_CLANG_REVISION "332838-1""
This change moves the first quote to before the -D, allowing Windows to
correctly handle the define parameter.

R=brettw@chromium.org

Bug: 396230
Change-Id: I4f6f70acf775577ff9b3077eba9ebf7f8d002da1
Reviewed-on: https://chromium-review.googlesource.com/1071274Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Joey Scarr <jsca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565117}