[Android] Move the remaining tests to internal shell test

1. Move HandleActionUriTest.java, SetDatabaseEnabledTest.java,
SetDomStorageEnabledTest.java, SetNetworkAvailableTest.java, UserAgentTest.java from
core shell test to core internal shell test.
2. Remove the unnecessary code in ShouldInterceptLoadRequestTest.java.
3. Remove the internal dependency in XWalkViewTestBase.java.