Remove unused roles(EditableText, SplitGroup, GrowArea) from Chromium.

content/shell/renderer/test_runner/web_ax_object_proxy.cc

Index: content/shell/renderer/test_runner/web_ax_object_proxy.cc
diff --git a/content/shell/renderer/test_runner/web_ax_object_proxy.cc b/content/shell/renderer/test_runner/web_ax_object_proxy.cc
index 3d7f17d0377718b3efa33930d509f055d30fe8b0..2844272b8b0ef4f0ab73374d03d86c6cefd8421d 100644
--- a/content/shell/renderer/test_runner/web_ax_object_proxy.cc
+++ b/content/shell/renderer/test_runner/web_ax_object_proxy.cc
@@ -80,8 +80,6 @@ std::string RoleToString(blink::WebAXRole role)
       return result.append("Div");
     case blink::WebAXRoleDocument:
       return result.append("Document");
-    case blink::WebAXRoleEditableText:
-      return result.append("EditableText");
     case blink::WebAXRoleEmbeddedObject:
       return result.append("EmbeddedObject");
     case blink::WebAXRoleFigcaption:
@@ -96,8 +94,6 @@ std::string RoleToString(blink::WebAXRole role)
       return result.append("Grid");
     case blink::WebAXRoleGroup:
       return result.append("Group");
-    case blink::WebAXRoleGrowArea:
-      return result.append("GrowArea");
     case blink::WebAXRoleHeading:
       return result.append("Heading");
     case blink::WebAXRoleIgnored:
@@ -204,8 +200,6 @@ std::string RoleToString(blink::WebAXRole role)
       return result.append("SpinButtonPart");
     case blink::WebAXRoleSpinButton:
       return result.append("SpinButton");
-    case blink::WebAXRoleSplitGroup:
-      return result.append("SplitGroup");
     case blink::WebAXRoleSplitter:
       return result.append("Splitter");
     case blink::WebAXRoleStaticText: