The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ae0304082bf05eeb62bd74b4ba9141f26cf1accb

commit ae0304082bf05eeb62bd74b4ba9141f26cf1accb
Author: Daniel Cheng <dcheng@chromium.org>
Date: Wed Apr 12 00:14:38 2017

blink_gc_plugin: Remove handling for legacy-style naming.

The plugin option is left as a stub for now, to avoid the build from
failing. It will be removed once the gn files no longer need to pass
this argument.

Bug:  675879 
Change-Id: Ib6c5da4e1d07d054704354367d12f8e34a50d41f
Reviewed-on: https://chromium-review.googlesource.com/474061
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#463852}
[modify] https://crrev.com/ae0304082bf05eeb62bd74b4ba9141f26cf1accb/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
[modify] https://crrev.com/ae0304082bf05eeb62bd74b4ba9141f26cf1accb/tools/clang/blink_gc_plugin/BlinkGCPluginConsumer.cpp
[modify] https://crrev.com/ae0304082bf05eeb62bd74b4ba9141f26cf1accb/tools/clang/blink_gc_plugin/BlinkGCPluginOptions.h
[modify] https://crrev.com/ae0304082bf05eeb62bd74b4ba9141f26cf1accb/tools/clang/blink_gc_plugin/CMakeLists.txt
[modify] https://crrev.com/ae0304082bf05eeb62bd74b4ba9141f26cf1accb/tools/clang/blink_gc_plugin/Config.cpp
[modify] https://crrev.com/ae0304082bf05eeb62bd74b4ba9141f26cf1accb/tools/clang/blink_gc_plugin/Config.h
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[delete] https://crrev.com/f1a29ebf18d1e876df019c862c9e4f6719aff64f/tools/clang/blink_gc_plugin/tests/legacy_naming/base_requires_tracing.cpp
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[delete] https://crrev.com/f1a29ebf18d1e876df019c862c9e4f6719aff64f/tools/clang/blink_gc_plugin/tests/legacy_naming/class_requires_finalization_field.h
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[delete

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/066ba1478d4ca2a3818be9d7b58056424e296910

commit 066ba1478d4ca2a3818be9d7b58056424e296910
Author: Daniel Cheng <dcheng@chromium.org>
Date: Wed Sep 20 06:00:28 2017

Don't pass use-chromium-style-naming to the BlinkGCPlugin.

This flag is a no-op now.

TBR=tkent@chromium.org

Bug:  675879 
Change-Id: Ia540cbd4483b2f12ac5e33d41feb10c812c1c04a
Reviewed-on: https://chromium-review.googlesource.com/673966
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#503065}
[modify] https://crrev.com/066ba1478d4ca2a3818be9d7b58056424e296910/third_party/WebKit/Source/BUILD.gn

https://chromium-review.googlesource.com/c/chromium/src/+/674283/ was the final bit for this (unfortunately I copy and pasted the wrong bug number...)