Switch all LayoutTests to use new AX name calculation

third_party/WebKit/Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications.",
@@ skipping 5172 matching lines @@
                 "description": "Enum of possible property types."
             },
             {
                 "id": "AXValueSourceType",
                 "type": "string",
                 "enum": [ "attribute", "implicit", "style", "contents", "placeholder", "relatedElement" ],
                 "description": "Enum of possible property sources."
             },
             { "id": "AXValueNativeSourceType",
               "type": "string",
-              "enum": [ "figcaption", "label", "labelfor", "labelwrapped", "tablecaption", "other" ],
+              "enum": [ "figcaption", "label", "labelfor", "labelwrapped", "legend", "tablecaption", "other" ],
               "description": "Enum of possible native property sources (as a subtype of a particular AXValueSourceType)."
             },
             {
                 "id": "AXValueSource",
                 "type": "object",
                 "properties": [
                     { "name": "type", "$ref": "AXValueSourceType", "description": "What type of source this is." },
                     { "name": "value", "$ref": "AXValue", "description": "The value of this property source.", "optional": true },
                     { "name": "attribute", "type": "string", "description": "The attribute, if any.", "optional": true },
                     { "name": "superseded", "type": "boolean", "description": "Whether this source is superseded by a higher priority source.", "optional": true },
@@ skipping 87 matching lines @@
                 ],
                 "returns": [
                     { "name": "accessibilityNode", "$ref": "AXNode", "description": "The <code>Accessibility.AXNode</code> for this DOM node, if it exists.", "optional": true }
                 ],
                 "description": "Fetches the accessibility node for this DOM node, if it exists.",
                 "hidden": true
             }
         ]
     }]
 }