Switch to using WebSettings only for accessibilityEnabled and inlineTextBoxAccess

Depends on https://codereview.chromium.org/495763005/

BUG=406622

Review URL: https://codereview.chromium.org/497273002

Cr-Commit-Position: refs/heads/master@{#292803}

content/renderer/accessibility/renderer_accessibility_complete.cc

@@ -40,7 +40,6 @@ RendererAccessibilityComplete::RendererAccessibilityComplete(
       serializer_(&tree_source_),
       last_scroll_offset_(gfx::Size()),
       ack_pending_(false) {
-  WebAXObject::enableAccessibility();
   WebView* web_view = render_frame_->GetRenderView()->GetWebView();
   WebSettings* settings = web_view->settings();
   settings->setAccessibilityEnabled(true);
@@ -49,7 +48,6 @@ RendererAccessibilityComplete::RendererAccessibilityComplete(
   // Skip inline text boxes on Android - since there are no native Android
   // APIs that compute the bounds of a range of text, it's a waste to
   // include these in the AX tree.
-  WebAXObject::enableInlineTextBoxAccessibility();
   settings->setInlineTextBoxAccessibilityEnabled(true);
 #endif
 

content/shell/renderer/test_runner/accessibility_controller.cc

@@ -147,10 +147,7 @@ void AccessibilityController::Reset() {
 }
 
 void AccessibilityController::Install(blink::WebFrame* frame) {
-  blink::WebAXObject::enableAccessibility();
   frame->view()->settings()->setAccessibilityEnabled(true);
-
-  blink::WebAXObject::enableInlineTextBoxAccessibility();
   frame->view()->settings()->setInlineTextBoxAccessibilityEnabled(true);
 
   AccessibilityControllerBindings::Install(weak_factory_.GetWeakPtr(), frame);