Revert "ipcz: Support dynamic runtime features"

This reverts commit 662e73f5705cdd9b089c8785e42096abf3ea9587.

Reason for revert:
LUCI Bisection has identified this change as the cause of a test failure. See the analysis: https://ci.chromium.org/ui/p/chromium/bisection/test-analysis/b/5200924853141504

Sample build with failed test: https://ci.chromium.org/b/8751158003263844609
Affected test(s):
[ninja://:blink_web_tests/virtual/dom-parts-disabled/fast/parser/adoption-agency-crash-01.html](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2F:blink_web_tests%2Fvirtual%2Fdom-parts-disabled%2Ffast%2Fparser%2Fadoption-agency-crash-01.html?q=VHash%3Ad656188f56ce4659)
[ninja://:blink_web_tests/virtual/dom-parts-disabled/fast/parser/badurl-base-preloader-crash.html](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2F:blink_web_tests%2Fvirtual%2Fdom-parts-disabled%2Ffast%2Fparser%2Fbadurl-base-preloader-crash.html?q=VHash%3Ad656188f56ce4659)
[ninja://:blink_web_tests/virtual/dom-parts-disabled/fast/parser/body-should-exist-after-open-close.html](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2F:blink_web_tests%2Fvirtual%2Fdom-parts-disabled%2Ffast%2Fparser%2Fbody-should-exist-after-open-close.html?q=VHash%3Ad656188f56ce4659)
[ninja://:blink_web_tests/virtual/dom-parts-disabled/fast/parser/broken-comments-vs-parsing-mode.html](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2F:blink_web_tests%2Fvirtual%2Fdom-parts-disabled%2Ffast%2Fparser%2Fbroken-comments-vs-parsing-mode.html?q=VHash%3Ad656188f56ce4659)
[ninja://:blink_web_tests/virtual/dom-parts-disabled/fast/parser/changing-attrbutes-crash.html](https://ci.chromium.org/ui/test/chromium/ninja:%2F%2F:blink_web_tests%2Fvirtual%2Fdom-parts-disabled%2Ffast%2Fparser%2Fchanging-attrbutes-crash.html?q=VHash%3Ad656188f56ce4659)
and 85 more ...

If this is a false positive, please report it at http://b.corp.google.com/createIssue?component=1199205&description=Analysis%3A+https%3A%2F%2Fci.chromium.org%2Fui%2Fp%2Fchromium%2Fbisection%2Ftest-analysis%2Fb%2F5200924853141504&format=PLAIN&priority=P3&title=Wrongly+blamed+https%3A%2F%2Fchromium-review.googlesource.com%2Fc%2Fchromium%2Fsrc%2F%2B%2F5420430&type=BUG

Original change's description:
> ipcz: Support dynamic runtime features
>
> Runtime features have generic integer identifiers to be defined in
> ipcz.h. Applications can enable or disable features through CreateNode()
> options, effectively allowing Chrome feature flags to influence internal
> ipcz features.
>
> Features enabled on a node are automatically shared with any connected
> nodes, allowing nodes to agree up-front about which features
> (e.g. protocol additions) to use in each others' presence to avoid any
> risk of wire incompatibility at runtime.
>
> This is a precursor to supporting alternative shared memory management
> and usage, among other future improvements. An initial
> IPCZ_FEATURE_MEM_V2 feature is added as a no-op for now.
>
> Bug: 332719403
> Change-Id: I01bfc2c7aab73912c3495d25c8373ae33610ad38
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5420430
> Commit-Queue: Ken Rockot <rockot@google.com>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1284291}
>

Bug: 332719403
Change-Id: I532dae7ad4342b89a3b44ae8c0c55a0de5b85d5d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5437569
Owners-Override: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1284390}