Remove support for the obsolete <isindex> tag.

LayoutTests/fast/replaced/table-percent-height-text-controls.html

Index: LayoutTests/fast/replaced/table-percent-height-text-controls.html
diff --git a/LayoutTests/fast/replaced/table-percent-height-text-controls.html b/LayoutTests/fast/replaced/table-percent-height-text-controls.html
index dcb64681a53da7f20d689c6ebf14ca0fe190ca94..ac485496ab4c201a91cef47133d535715f57ce1f 100644
--- a/LayoutTests/fast/replaced/table-percent-height-text-controls.html
+++ b/LayoutTests/fast/replaced/table-percent-height-text-controls.html
@@ -76,10 +76,6 @@ function test()
     // Note: This behavior doesn't match to IE 8, Firefox 3.5 and Opera 10.
     is75PercentOf("getFullHeight('input-text-75')", "getFullHeight('input-text-100')");
 
-    shouldBe("getWidth('isindex-75')", "getWidth('isindex-100')");
-    shouldBeTrue("getFullHeight('isindex-75') != '0px'");
-    shouldBe("getFullHeight('isindex-75')", "getFullHeight('isindex-100')");
-
     shouldBe("getWidth('textarea-75')", "getWidth('textarea-100')");
     shouldBeTrue("getFullHeight('textarea-75') != '0px'");
     // Note: This behavior doesn't match to IE 8, Firefox 3.5 and Opera 10.
@@ -101,9 +97,6 @@ function test()
 <table><tr><td><input type="text" id="input-text-75" style="height: 75%;"></td></tr></table>
 <table><tr><td><input type="text" id="input-text-100" style="height: 100%;"></td></tr></table>
 
-<table><tr><td><isindex id="isindex-75" style="height: 75%;"></td></tr></table>
-<table><tr><td><isindex id="isindex-100" style="height: 100%;"></td></tr></table>
-
 <table><tr><td><textarea id="textarea-75" style="height: 75%;"></textarea></td></tr></table>
 <table><tr><td><textarea id="textarea-100" style="height: 100%;"></textarea></td></tr></table>