Change the location of buildtools.

It has changed from its own repo to part of Chromium's.

Change-Id: I09623593cc79d3a688953d018633b99ca2a63e90
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/52098
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

DEPS

diff --git a/DEPS b/DEPS
index 8381969..8eb5120 100644
--- a/DEPS
+++ b/DEPS
@@ -15,7 +15,7 @@
   'android_ndk_revision': '4e2cea441bfd43f0863d14f57b1e1844260b9884',
   'binutils_revision': '2be73f7fbf783d7a0b288e174a5773b67c7656bc',
   'build_revision': 'e51ca1d98734b400979f9fe5695e2ef76f334a80',
-  'buildtools_revision': '6fbda1b24c1893a893b17aa219b765b9e7c801d8',
+  'buildtools_revision': '106e9fce3799633f42b45ca8bbe9e84e1e235603',
   'catapult_revision': 'ec795debc5c195658e95f5e750f6c0895c8171f2',
   'clang_revision': '207fd1e5dc049d231e12f4f0c8937b39ba549afb',
   'code_coverage_revision': '0e34d1463558f5a32308d0808e04e85cfe95f4a4',
@@ -45,7 +45,7 @@
     Var('chromium_git') + "/chromium/src/build.git@" + Var('build_revision'),
 
   "buildtools":
-    Var('chromium_git') + "/chromium/buildtools.git@" +
+    Var('chromium_git') + "/chromium/src/buildtools.git@" +
         Var('buildtools_revision'),
 
   "testing/corpus":