Improve coverage of ResourceLoaderGlobalUserModule

Change-Id: Iec070553e5f6108ecbe4ad0d220857d42cffcfea
Make helper functions in in ResourceLoaderGlobalModuleTestCase non-static

Change-Id: I21f600c943a42c50a91005945d52db2a3b00d3e1
Add a test for ResourceLoaderGlobalModule::getSource()

Change-Id: Icd8537f2698adb835e5cd0444bfa15c7b3f6fc1a