Revert "Make ComputeIsFixedContainer return false for SVG elements other than"

This reverts commit c2b3bfc165b94cc8cab039b3c1b3b9ae21039c45.

Reason for revert: Didn't fixed bug https://bugs.chromium.org/p/chromium/issues/detail?id=1316974

Original change's description:
> Make ComputeIsFixedContainer return false for SVG elements other than
> foreignObject
>
> Make ComputeIsFixedContainer return false for SVG elements other than
> foreignObject as this check is irrelevant for SVG elements and caused
> inconsistency problems.
>
> Also add crash tests.
>
> Fixed: 1308025
> Change-Id: I3fe211d2e13839ced2464c3204f5e035d145f4b1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3561852
> Reviewed-by: David Baron <dbaron@chromium.org>
> Reviewed-by: Philip Rogers <pdr@chromium.org>
> Commit-Queue: Yotam Hacohen <yotha@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#988943}

Change-Id: I6905c8c50bb312006178778a430b41c635d76bdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3597703
Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/main@{#994421}
diff --git a/editing/crashtests/fixed-property-for-svg-element-001.html b/editing/crashtests/fixed-property-for-svg-element-001.html
deleted file mode 100644
index bbce43e..0000000
--- a/editing/crashtests/fixed-property-for-svg-element-001.html
+++ /dev/null
@@ -1,28 +0,0 @@
-<!DOCTYPE html>
-<html class="test-wait">
-<title>Changing designmode of SVG inline elements with contain: layout style should not crash.</title>
-<link rel="author" title="Yotam Hacohen" href="mailto:yotha@chromium.org">
-<link rel="author" title="Google" href="http://www.google.com/">
-<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1308025">
-<meta name="assert" content="This should not crash.">
-
-<svg>
-  <text y="10">
-    <a id="texta" style="float: left; contain: layout;">
-      PASS if no crash.
-    </a>
-  </text>
-</svg>
-
-
-<script>
-requestAnimationFrame(function() {
-  requestAnimationFrame(function() {
-    document.designMode = "on";
-    requestAnimationFrame(function() {
-      document.documentElement.classList.remove("test-wait");
-    });
-  });
-});
-
-</script>
diff --git a/editing/crashtests/fixed-property-for-svg-element-002.html b/editing/crashtests/fixed-property-for-svg-element-002.html
deleted file mode 100644
index 28973c4..0000000
--- a/editing/crashtests/fixed-property-for-svg-element-002.html
+++ /dev/null
@@ -1,28 +0,0 @@
-<!DOCTYPE html>
-<html class="test-wait">
-<title>Changing designmode of SVG inline elements with transform-style should not crash.</title>
-<link rel="author" title="Yotam Hacohen" href="mailto:yotha@chromium.org">
-<link rel="author" title="Google" href="http://www.google.com/">
-<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1308025">
-<meta name="assert" content="This should not crash.">
-
-<svg>
-  <text y="10">
-    <a id="texta" style="float: left; transform-style: preserve-3d;">
-      PASS if no crash.
-    </a>
-  </text>
-</svg>
-
-
-<script>
-requestAnimationFrame(function() {
-  requestAnimationFrame(function() {
-    document.designMode = "on";
-    requestAnimationFrame(function() {
-      document.documentElement.classList.remove("test-wait");
-    });
-  });
-});
-
-</script>