Bug 1359453 - Use standard exception for selection.removeRange() r=masayuki

The test change is already upstream:
https://github.com/w3c/web-platform-tests/pull/5686

The spec change has not officially been accepted yet as of this writing,
possibly delayed for IPR review:
https://github.com/w3c/selection-api/pull/87

MozReview-Commit-ID: 3auwvwP4X72

--HG--
extra : rebase_source : 0396cd7c454b234598d77427bc20c6ea0645dc2e

layout/generic/nsSelection.cpp

@@ -4076,7 +4076,7 @@ Selection::RemoveItem(nsRange* aItem)
     }
   }
   if (idx < 0)
-    return NS_ERROR_INVALID_ARG;
+    return NS_ERROR_DOM_NOT_FOUND_ERR;
 
   mRanges.RemoveElementAt(idx);
   aItem->SetSelection(nullptr);

testing/web-platform/meta/selection/removeRange.html.ini

@@ -1,86 +0,0 @@
-[removeRange.html]
-  type: testharness
-  [removeRange() with Range 0]
-    expected: FAIL
-
-  [removeRange() with Range 1]
-    expected: FAIL
-
-  [removeRange() with Range 2]
-    expected: FAIL
-
-  [removeRange() with Range 3]
-    expected: FAIL
-
-  [removeRange() with Range 4]
-    expected: FAIL
-
-  [removeRange() with Range 5]
-    expected: FAIL
-
-  [removeRange() with Range 6]
-    expected: FAIL
-
-  [removeRange() with Range 7]
-    expected: FAIL
-
-  [removeRange() with Range 14]
-    expected: FAIL
-
-  [removeRange() with Range 15]
-    expected: FAIL
-
-  [removeRange() with Range 16]
-    expected: FAIL
-
-  [removeRange() with Range 17]
-    expected: FAIL
-
-  [removeRange() with Range 18]
-    expected: FAIL
-
-  [removeRange() with Range 22]
-    expected: FAIL
-
-  [removeRange() with Range 23]
-    expected: FAIL
-
-  [removeRange() with Range 26]
-    expected: FAIL
-
-  [removeRange() with Range 27]
-    expected: FAIL
-
-  [removeRange() with Range 28]
-    expected: FAIL
-
-  [removeRange() with Range 29]
-    expected: FAIL
-
-  [removeRange() with Range 30]
-    expected: FAIL
-
-  [removeRange() with Range 31]
-    expected: FAIL
-
-  [removeRange() with Range 32]
-    expected: FAIL
-
-  [removeRange() with Range 34]
-    expected: FAIL
-
-  [removeRange() with Range 35]
-    expected: FAIL
-
-  [removeRange() with Range 36]
-    expected: FAIL
-
-  [removeRange() with Range 37]
-    expected: FAIL
-
-  [removeRange() with Range 38]
-    expected: FAIL
-
-  [removeRange() with Range 39]
-    expected: FAIL
-

testing/web-platform/tests/selection/removeRange.html

@@ -30,7 +30,9 @@ testRanges.forEach(function(rangeData, index) {
         var equivalentRange = ownerDocument(endpoints[0]).createRange();
         equivalentRange.setStart(endpoints[0], endpoints[1]);
         equivalentRange.setEnd(endpoints[2], endpoints[3]);
-        selection.removeRange(equivalentRange);
+        assert_throws("NotFoundError",
+                      function() { selection.removeRange(equivalentRange) },
+                      "Removing a different range should throw");
         assert_equals(selection.rangeCount, 1, 'Equivalent Range should not remove the registered Range.');
 
     }, 'removeRange() with Range ' + index);