CppTools/Clang: Remove InMemoryInfo

...nowadays we only need the working copy.

Change-Id: I30924b3c5dc68b428d6c10f6ba015b0640b476d2
Reviewed-by: Marco Bubke <marco.bubke@theqtcompany.com>

src/plugins/cpptools/cpptoolsreuse.cpp

@@ -289,11 +289,4 @@ bool skipFileDueToSizeLimit(const QFileInfo &fileInfo, int limitInMB)
     return false;
 }
 
-Utils::FileNameList modifiedFiles()
-{
-    Utils::FileNameList files = Utils::transform(Core::DocumentManager::modifiedDocuments(),
-                                                 [](Core::IDocument *d) -> Utils::FileName { return d->filePath(); });
-    return Utils::filteredUnique(files);
-}
-
 } // CppTools