Revert of Migrate accessibility from RenderView to RenderFrame.

chrome/browser/chrome_browser_application_mac.mm

Index: chrome/browser/chrome_browser_application_mac.mm
diff --git a/chrome/browser/chrome_browser_application_mac.mm b/chrome/browser/chrome_browser_application_mac.mm
index c48d6cc9f29858e75afb2554cc6754b14dd48e21..3368c06351486e4ff3bf4657a30be1c00d1b420f 100644
--- a/chrome/browser/chrome_browser_application_mac.mm
+++ b/chrome/browser/chrome_browser_application_mac.mm
@@ -538,6 +538,11 @@
   if ([attribute isEqualToString:@"AXEnhancedUserInterface"] &&
       [value intValue] == 1) {
     content::BrowserAccessibilityState::GetInstance()->OnScreenReaderDetected();
+    for (TabContentsIterator it; !it.done(); it.Next()) {
+      if (content::WebContents* contents = *it)
+        if (content::RenderViewHost* rvh = contents->GetRenderViewHost())
+          rvh->EnableFullAccessibilityMode();
+    }
   }
   return [super accessibilitySetValue:value forAttribute:attribute];
 }