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..9fb5fdf74a518f826fd4dcb4c4fb666bf4942ad6 100644
--- a/content/browser/accessibility/browser_accessibility_state_impl.cc
+++ b/content/browser/accessibility/browser_accessibility_state_impl.cc
@@ -33,20 +33,20 @@ BrowserAccessibilityStateImpl* BrowserAccessibilityStateImpl::GetInstance() {
 
 BrowserAccessibilityStateImpl::BrowserAccessibilityStateImpl()
     : BrowserAccessibilityState(),
-      accessibility_mode_(AccessibilityModeOff) {
+      accessibility_mode_(ACCESSIBILITY_MODE_OFF) {
 #if defined(OS_WIN)
   // On Windows 8, always enable accessibility for editable text controls
   // so we can show the virtual keyboard when one is enabled.
   if (base::win::GetVersion() >= base::win::VERSION_WIN8 &&
       !CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableRendererAccessibility)) {
-    accessibility_mode_ = AccessibilityModeEditableTextOnly;
+    accessibility_mode_ = ACCESSIBILITY_MODE_EDITABLE_TEXT_ONLY;
   }
 #endif  // defined(OS_WIN)
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kForceRendererAccessibility)) {
-    accessibility_mode_ = AccessibilityModeComplete;
+    accessibility_mode_ = ACCESSIBILITY_MODE_COMPLETE;
   }
 
 #if defined(OS_WIN)
@@ -77,16 +77,16 @@ void BrowserAccessibilityStateImpl::OnScreenReaderDetected() {
           switches::kDisableRendererAccessibility)) {
     return;
   }
-  SetAccessibilityMode(AccessibilityModeComplete);
+  SetAccessibilityMode(ACCESSIBILITY_MODE_COMPLETE);
 }
 
 void BrowserAccessibilityStateImpl::OnAccessibilityEnabledManually() {
   // We may want to do something different with this later.
-  SetAccessibilityMode(AccessibilityModeComplete);
+  SetAccessibilityMode(ACCESSIBILITY_MODE_COMPLETE);
 }
 
 bool BrowserAccessibilityStateImpl::IsAccessibleBrowser() {
-  return (accessibility_mode_ == AccessibilityModeComplete);
+  return (accessibility_mode_ == ACCESSIBILITY_MODE_COMPLETE);
 }
 
 void BrowserAccessibilityStateImpl::AddHistogramCallback(