Add deprecated tag and note StrictMode violation

This method is already @deprecated in docs anyway.
StrictMode.noteSlowCall can help apps discover the error.

Change-Id: Ie131d938b0dd32f85ec1886e2139ce3c3f511209

Author: Jonathan Dixon

core/java/android/webkit/WebView.java

@@ -1281,8 +1281,10 @@ public void findNext(boolean forward) {
      * @deprecated {@link #findAllAsync} is preferred.
      * @see #setFindListener
      */
+    @Deprecated
     public int findAll(String find) {
         checkThread();
+        StrictMode.noteSlowCall("findAll blocks UI: prefer findAllAsync");
         return mProvider.findAll(find);
     }