Remove checkout_google_benchmark from DEPS.

This was added in https://pdfium-review.googlesource.com/71152 for V8,
but is no longer required since checkout_google_benchmark is now the
default in V8. See https://crbug.com/v8/11639 for context.

Change-Id: I7e082f479acc54e5defc8c537f2976cc5044ff61
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/95590
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nigi <nigi@chromium.org>
diff --git a/DEPS b/DEPS
index 5bee48e..8231826 100644
--- a/DEPS
+++ b/DEPS
@@ -1,9 +1,7 @@
 use_relative_paths = True
 
 gclient_gn_args_file = 'build/config/gclient_args.gni'
-gclient_gn_args = [
-  'checkout_google_benchmark',
-]
+gclient_gn_args = []
 
 vars = {
   # By default, we should check out everything needed to run on the main
@@ -13,11 +11,6 @@
   #      "custom_vars": { "checkout_configuration": "small" },
   'checkout_configuration': 'default',
 
-  # By default, do not check out Google Benchmark. This only exists to satisfy
-  # V8-enabled builds that require this variable. Running Google Benchmark is
-  # not supported with PDFium.
-  'checkout_google_benchmark': False,
-
   'checkout_instrumented_libraries': 'checkout_linux and checkout_configuration != "small"',
 
   'checkout_testing_corpus': 'checkout_configuration != "small"',