Revert "[clangd] Add tweak to override pure virtuals (llvm#139348)" (llvm#150404)

This reverts commit 7355ea3.

Buildbot failures:

UBsan
https://lab.llvm.org/buildbot/#/builders/25/builds/10010
Fast
https://lab.llvm.org/buildbot/#/builders/169/builds/13150

Author: qinkunbao

clang-tools-extra/clangd/refactor/tweaks/CMakeLists.txt

@@ -14,17 +14,16 @@ set(LLVM_LINK_COMPONENTS
 add_clang_library(clangDaemonTweaks OBJECT
   AddUsing.cpp
   AnnotateHighlightings.cpp
+  DumpAST.cpp
   DefineInline.cpp
   DefineOutline.cpp
-  DumpAST.cpp
   ExpandDeducedType.cpp
   ExpandMacro.cpp
   ExtractFunction.cpp
   ExtractVariable.cpp
   MemberwiseConstructor.cpp
   ObjCLocalizeStringLiteral.cpp
   ObjCMemberwiseInitializer.cpp
-  OverridePureVirtuals.cpp
   PopulateSwitch.cpp
   RawStringLiteral.cpp
   RemoveUsingNamespace.cpp