Adds dependency on sanitizer

The santizer target is empty if no sanitizers are defined, otherwise
it contains the necessary targets. Because of this we can always
depend on it. Without this dep asan builds fail.

BUG=none
TEST=none
R=brettw@chromium.org
TBR=brettw@chromium.org

Review URL: https://codereview.chromium.org/694053002

Cr-Original-Commit-Position: refs/heads/master@{#302346}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b816da5b4e0433f12366f27abe2ba0223c5e8583
diff --git a/BUILD.gn b/BUILD.gn
index 4a3ad3c..23a52ae 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -10,4 +10,6 @@
   configs += [
     "//build/config/linux:x11"
   ]
+
+  deps = [ "//build/config/sanitizers:deps" ]
 }