Disallow 'position: sticky' on <thead> and <tr> elements.

third_party/WebKit/LayoutTests/fast/css/sticky/sticky-table-th-top.html

Index: third_party/WebKit/LayoutTests/fast/css/sticky/sticky-table-th-top.html
diff --git a/third_party/WebKit/LayoutTests/fast/css/sticky/sticky-table-thead-top.html b/third_party/WebKit/LayoutTests/fast/css/sticky/sticky-table-th-top.html
similarity index 87%
rename from third_party/WebKit/LayoutTests/fast/css/sticky/sticky-table-thead-top.html
rename to third_party/WebKit/LayoutTests/fast/css/sticky/sticky-table-th-top.html
index 91e359d5604d64ae50052220999dca0e9860f816..8511005123c3ef05ae8ffd9272c636254c7c9739 100644
--- a/third_party/WebKit/LayoutTests/fast/css/sticky/sticky-table-thead-top.html
+++ b/third_party/WebKit/LayoutTests/fast/css/sticky/sticky-table-th-top.html
@@ -64,9 +64,9 @@ if (window.internals) {
     <div class="group">
         <div class="indicator box" style="top: 200px;"></div>
         <table class="container">
-            <thead class="sticky">
+            <thead>
                 <tr>
-                    <td class="box"></td>
+                    <th class="sticky box"></th>
                 </tr>
             </thead>
             <tbody>
@@ -80,9 +80,9 @@ if (window.internals) {
     <div class="group" style="top: 100px">
         <div class="indicator box" style="top: 100px;"></div>
         <table class="container" style="">
-            <thead class="sticky">
+            <thead>
                 <tr>
-                    <td class="box"></td>
+                    <td class="sticky box"></td>
                 </tr>
             </thead>
             <tbody>
@@ -96,9 +96,9 @@ if (window.internals) {
     <div class="group" style="top: 200px">
         <div class="indicator box" style="top: 0;"></div>
         <table class="container" style="">
-            <thead class="sticky">
+            <thead>
                 <tr>
-                    <td class="box"></td>
+                    <td class="sticky box"></td>
                 </tr>
             </thead>
             <tbody>
@@ -109,7 +109,7 @@ if (window.internals) {
         </table>
     </div>
     <div style="position: absolute; top: 620px;">
-    This test checks that sticky positioned table theads are contained by their table.
+    This test checks that sticky positioned table ths are contained by their table.
     There should be no red.
     </div>
 </body>