Roll DEPS for build to 7ac2934.

https://chromium.googlesource.com/chromium/src/build/+log/10a93c2c..7ac2934

TBR=dsinclair@chromium.org

Change-Id: Ib19b77165fd2cbafbaac73e79ebb1ac4c0a3af70
Reviewed-on: https://pdfium-review.googlesource.com/36832
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index c462302..ef9903a 100644
--- a/DEPS
+++ b/DEPS
@@ -15,7 +15,7 @@
 
   'android_ndk_revision': '5cd86312e794bdf542a3685c6f10cbb96072990b',
   'binutils_revision': 'e146228c20af6af922887d0be2d3641cbffb33c5',
-  'build_revision': '10a93c2ce7360864b59aecfed4c6b8608cd2f0cc',
+  'build_revision': '7ac293430bfc16826dc27680c6c3c60911f10759',
   'buildtools_revision': '893eb86b02b2571894e328f05551112b96df1cce',
   'catapult_revision': '8fbdf9f10b76595b6299e577709f2608ae29e19a',
   'clang_revision': 'dec27d726d78471325a143a49863846e91d39df8',