Rename getMainSourceSet -> getMainSourceProvider

Change-Id: I06f25c1c00ab236fa4c68f42be71da83562fc0fd
diff --git a/src/com/google/gct/idea/appengine/wizard/NewAppEngineModuleAction.java b/src/com/google/gct/idea/appengine/wizard/NewAppEngineModuleAction.java
index d48f96b..98f9096 100644
--- a/src/com/google/gct/idea/appengine/wizard/NewAppEngineModuleAction.java
+++ b/src/com/google/gct/idea/appengine/wizard/NewAppEngineModuleAction.java
@@ -190,7 +190,7 @@
       String backendModulePath = (String) replacementMap.get(TemplateMetadata.ATTR_PROJECT_OUT);
       replacementMap.put(ATTR_SERVER_MODULE_PATH, FileUtil.getRelativePath(targetFolder.getPath(), backendModulePath, '/'));
       replacementMap.put(TemplateMetadata.ATTR_PROJECT_OUT, targetFolder.getPath());
-      List<SourceProvider> sourceProviders = IdeaSourceProvider.getSourceProvidersForFile(facet, targetFolder, facet.getMainSourceSet());
+      List<SourceProvider> sourceProviders = IdeaSourceProvider.getSourceProvidersForFile(facet, targetFolder, facet.getMainSourceProvider());
       SourceProvider sourceProvider = sourceProviders.get(0);
       File manifestDirectory = NewTemplateObjectWizard.findManifestDirectory(sourceProvider);
       replacementMap.put(TemplateMetadata.ATTR_MANIFEST_DIR, manifestDirectory.getPath());