Explicitly export content providers

In a future version of Android, the default value for
<provider android:exported> will change from true to false.
Explicitly set android:exported="true"

Bug: 3306452
Change-Id: Ic8adfe95ce0e8b5a33a8de4f5ac4f4ff184a67e8
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 1831462..d871dbf 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -57,6 +57,7 @@
         <provider android:name=".provider.BrowserProvider2"
                   android:authorities="com.android.browser;browser"
                   android:multiprocess="false"
+                  android:exported="true"
                   android:readPermission="com.android.browser.permission.READ_HISTORY_BOOKMARKS"
                   android:writePermission="com.android.browser.permission.WRITE_HISTORY_BOOKMARKS">
             <path-permission android:path="/bookmarks/search_suggest_query"