CppTools: Reduce calls to mime database.

...by removing the unneeded ProjectFileAdder. Its job is already done
earlier, so use the results.

Change-Id: Ifd865e6203ed6162a0d852c2128fb6d30208a52b
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>

src/plugins/cpptools/projectpartbuilder.h

@@ -66,7 +66,8 @@ public:
                                              const Utils::FileName &sysRoot);
 
 private:
-    void createProjectPart(const QStringList &theSources, const QString &partName,
+    void createProjectPart(const QVector<ProjectFile> &theSources,
+                           const QString &partName,
                            ProjectPart::LanguageVersion languageVersion,
                            ProjectPart::LanguageExtensions languageExtensions);