Add table { text-indent: initial } as UA style

As per https://html.spec.whatwg.org/multipage/rendering.html#tables-2 ,
text-indent for table should be initial.

Bug: 999088
Change-Id: I59833ff9684f04916f112c585be0ceafbfe6d7c4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2395900Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Sang Woo Ko <sangwoo108@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804807}

third_party/blink/renderer/core/html/resources/html.css

@@ -248,7 +248,8 @@ table {
     border-collapse: separate;
     border-spacing: 2px;
     border-color: gray;
-    box-sizing: border-box
+    box-sizing: border-box;
+    text-indent: initial
 }
 
 thead {

third_party/blink/web_tests/external/wpt/html/rendering/non-replaced-elements/tables/table-ua-stylesheet-expected.txt

-This is a testharness.js-based test.
-PASS Computed 'display' on table should match html spec
-PASS Computed 'box-sizing' on table should match html spec
-PASS Computed 'border-spacing' on table should match html spec
-PASS Computed 'border-collapse' on table should match html spec
-FAIL Computed 'text-indent' on table should match html spec assert_equals: expected "0px" but got "100px"
-Harness: the test ran to completion.
-