Remove use-chromium-style-naming option from BlinkGCPlugin

Bug: 673966
Change-Id: If0991048ed26f584f3a7fda081d561dc3f30f194
Reviewed-on: https://chromium-review.googlesource.com/674283
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#503073}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5e2158cebad5831d103a3bfdb85e9969b7275198
diff --git a/blink_gc_plugin/BlinkGCPlugin.cpp b/blink_gc_plugin/BlinkGCPlugin.cpp
index bd0ec38..36db12a 100644
--- a/blink_gc_plugin/BlinkGCPlugin.cpp
+++ b/blink_gc_plugin/BlinkGCPlugin.cpp
@@ -37,8 +37,6 @@
         options_.warn_unneeded_finalizer = true;
       } else if (arg == "enable-weak-members-in-unmanaged-classes") {
         options_.enable_weak_members_in_unmanaged_classes = true;
-      } else if (arg == "use-chromium-style-naming") {
-        // TODO(dcheng): Remove this once the build no longer passes this flag.
       } else {
         llvm::errs() << "Unknown blink-gc-plugin argument: " << arg << "\n";
         return false;