Move some accessibility methods, enums and interfaces into the content/public API.

content/browser/accessibility/browser_accessibility_state_impl.cc

Index: content/browser/accessibility/browser_accessibility_state_impl.cc
diff --git a/content/browser/accessibility/browser_accessibility_state_impl.cc b/content/browser/accessibility/browser_accessibility_state_impl.cc
index 3cb73fe8a8e1656c440ca4537933d387e658a8e2..33ad52403bc42b9bb638f08295f1ada2f28d401c 100644
--- a/content/browser/accessibility/browser_accessibility_state_impl.cc
+++ b/content/browser/accessibility/browser_accessibility_state_impl.cc
@@ -126,4 +126,15 @@ void BrowserAccessibilityStateImpl::SetAccessibilityMode(
   accessibility_mode_ = mode;
 }
 
+bool BrowserAccessibilityStateImpl::GetAccessibilityEnabled() {
+  return accessibility_mode_ == AccessibilityModeComplete;
+}
+
+void BrowserAccessibilityStateImpl::SetAccessibilityEnabled(bool enabled) {
+  if (enabled)
+    SetAccessibilityMode(AccessibilityModeComplete);
+  else
+    SetAccessibilityMode(AccessibilityModeOff);
+}
+
 }  // namespace content