Remove deprecated use_relative_hooks setting from DEPS.

Bug: chromium:1107325
Change-Id: I13e5f026cc95b0000e07ffe5667faaf18e088b41
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/71771
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/DEPS b/DEPS
index c5b83eb..dea8ed5 100644
--- a/DEPS
+++ b/DEPS
@@ -1,5 +1,4 @@
 use_relative_paths = True
-use_relative_hooks = True
 
 gclient_gn_args_file = 'build/config/gclient_args.gni'
 gclient_gn_args = [