Add more fine-grained accessibility modes.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 24be3e297f298557beb17143989203ed9827b985..3a5ffb5ec9c8e03d6bc2c4557f0ca1b79dfec4b3 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -31,7 +31,6 @@
 #include "build/build_config.h"
 #include "components/mime_util/mime_util.h"
 #include "components/url_formatter/url_formatter.h"
-#include "content/browser/accessibility/accessibility_mode_helper.h"
 #include "content/browser/accessibility/browser_accessibility_state_impl.h"
 #include "content/browser/bad_message.h"
 #include "content/browser/browser_plugin/browser_plugin_embedder.h"
@@ -959,11 +958,7 @@ void WebContentsImpl::SetAccessibilityMode(AccessibilityMode mode) {
 }
 
 void WebContentsImpl::AddAccessibilityMode(AccessibilityMode mode) {
-  SetAccessibilityMode(AddAccessibilityModeTo(accessibility_mode_, mode));
-}
-
-void WebContentsImpl::RemoveAccessibilityMode(AccessibilityMode mode) {
-  SetAccessibilityMode(RemoveAccessibilityModeFrom(accessibility_mode_, mode));
+  SetAccessibilityMode(accessibility_mode_ | mode);
 }
 
 void WebContentsImpl::RequestAXTreeSnapshot(AXTreeSnapshotCallback callback) {
@@ -1074,21 +1069,21 @@ const std::string& WebContentsImpl::GetUserAgentOverride() const {
   return renderer_preferences_.user_agent_override;
 }
 
-void WebContentsImpl::EnableTreeOnlyAccessibilityMode() {
+void WebContentsImpl::EnableWebContentsOnlyAccessibilityMode() {
   if (GetAccessibilityMode() != AccessibilityModeOff) {
     for (RenderFrameHost* rfh : GetAllFrames())
       ResetAccessibility(rfh);
   } else {
-    AddAccessibilityMode(AccessibilityModeTreeOnly);
+    AddAccessibilityMode(kAccessibilityModeWebContentsOnly);
   }
 }
 
-bool WebContentsImpl::IsTreeOnlyAccessibilityModeForTesting() const {
-  return accessibility_mode_ == AccessibilityModeTreeOnly;
+bool WebContentsImpl::IsWebContentsOnlyAccessibilityModeForTesting() const {
+  return accessibility_mode_ == kAccessibilityModeWebContentsOnly;
 }
 
 bool WebContentsImpl::IsFullAccessibilityModeForTesting() const {
-  return accessibility_mode_ == AccessibilityModeComplete;
+  return accessibility_mode_ == kAccessibilityModeComplete;
 }
 
 const PageImportanceSignals& WebContentsImpl::GetPageImportanceSignals() const {