Update Previews infbar accessibility string

chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java

Index: chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java b/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java
index a3711c7d10d4407219861bacf4feb1686dcf84fc..c8e36249a0ed3661073d50394152d3e80f8d7d39 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/infobar/InfoBar.java
@@ -132,6 +132,13 @@ public abstract class InfoBar implements InfoBarView {
         return mView;
     }
 
+    /**
+     * Returns the accessibility message from the view to announce when this infobar is first shown.
+     */
+    protected CharSequence getAccessibilityMessage(TextView messageView) {
+        return messageView.getText();
+    }
+
     @Override
     public CharSequence getAccessibilityText() {
         if (mView == null) return "";
@@ -141,7 +148,8 @@ public abstract class InfoBar implements InfoBarView {
         if (usesCompactLayout()) return mContext.getString(R.string.bottom_bar_screen_position);
         TextView messageView = (TextView) mView.findViewById(R.id.infobar_message);
         if (messageView == null) return "";
-        return messageView.getText() + mContext.getString(R.string.bottom_bar_screen_position);
+        return getAccessibilityMessage(messageView)
+                + mContext.getString(R.string.bottom_bar_screen_position);
     }
 
     @Override