Roll build/ a525b65ef..ef1e2b871 (27 commits)

https://chromium.googlesource.com/chromium/src/build.git/+log/a525b65ef9bb..ef1e2b8718ad

$ git log a525b65ef..ef1e2b871 --date=short --no-merges --format='%ad %ae %s'

This stops setting secondary_source in GN.

Created with:
  roll-dep build

BUG=chromium:947060
TBR=thakis@chromium.org

Change-Id: I3b84054bb6fd943375e3dfbe3bfdd7148bcd140c
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/52666
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index 509c2fa..7c153ee 100644
--- a/DEPS
+++ b/DEPS
@@ -14,7 +14,7 @@
 
   'android_ndk_revision': '4e2cea441bfd43f0863d14f57b1e1844260b9884',
   'binutils_revision': '2be73f7fbf783d7a0b288e174a5773b67c7656bc',
-  'build_revision': 'a525b65ef9bb356deb0d45bdeda56b9faf09d544',
+  'build_revision': 'ef1e2b8718ad4bfa0427b1ee6d93309a135c710b',
   'buildtools_revision': '62f9eb0d64d6bf48f620b8233d9f7a1dc07f8414',
   'catapult_revision': 'ec795debc5c195658e95f5e750f6c0895c8171f2',
   'clang_revision': 'adc6ac450cea4f39ec778437696afbcd163d2a93',