Update the manifest to mark the activity as the default.

This was needed during testing and threw an exception without it. Not sure how
Derek got around not having it before.

diff --cc AndroidManifest.xml
index a355610,cee3573..b23f113
--- 1/AndroidManifest.xml
--- 2/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@@ -183,6 -183,11 +183,12 @@@
          <!-- Makes .BrowserActivity the search target for any activity in Browser -->
          <meta-data android:name="android.app.default_searchable" android:value=".BrowserActivity" />
  
+         <activity android:name="android.webkit.PluginActivity">
+             <intent-filter>
+                 <action android:name="android.intent.webkit.PLUGIN" />
++                <category android:name="android.intent.category.DEFAULT" />
+             </intent-filter>
+         </activity>
  
      </application>