Only fire accessible load complete events on the main frame on Android.

content/browser/accessibility/browser_accessibility_manager_android.cc

Index: content/browser/accessibility/browser_accessibility_manager_android.cc
diff --git a/content/browser/accessibility/browser_accessibility_manager_android.cc b/content/browser/accessibility/browser_accessibility_manager_android.cc
index b0d8c9ccce77995f2c7980e058747639dd5bf848..35332d87e108f4ce91148ec12123b9139fd52e11 100644
--- a/content/browser/accessibility/browser_accessibility_manager_android.cc
+++ b/content/browser/accessibility/browser_accessibility_manager_android.cc
@@ -224,6 +224,12 @@ void BrowserAccessibilityManagerAndroid::NotifyAccessibilityEvent(
   Java_BrowserAccessibilityManager_handleContentChanged(
       env, obj.obj(), node->unique_id());
 
+  // Ignore load complete events on iframes.
+  if (event_type == ui::AX_EVENT_LOAD_COMPLETE &&
+      node->manager() != GetRootManager()) {
+    return;
+  }
+
   switch (event_type) {
     case ui::AX_EVENT_LOAD_COMPLETE:
       Java_BrowserAccessibilityManager_handlePageLoaded(