AbstractProcessStep: De-virtualize finish() method

Provide a setDoneHook() setter instead. The hook is
introduced temporarily, as when all the subclasses
are transformed to use the task tree, the done hook
is going to be a part of the subclass' recipe.

Task-number: QTCREATORBUG-29168
Change-Id: Idbc0f8b8a32c8df2fa5ecb73ed1cbaedad99620d
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/cmakeinstallstep.cpp

@@ -38,13 +38,12 @@ public:
         cmakeArguments.setDisplayStyle(StringAspect::LineEditDisplay);
 
         setCommandLineProvider([this] { return cmakeCommand(); });
+        setDoneHook([this](bool) { emit progress(100, {}); });
     }
 
 private:
     CommandLine cmakeCommand() const;
 
-    void finish(ProcessResult result) override;
-
     void setupOutputFormatter(OutputFormatter *formatter) override;
     QWidget *createConfigWidget() override;
 
@@ -83,12 +82,6 @@ CommandLine CMakeInstallStep::cmakeCommand() const
     return cmd;
 }
 
-void CMakeInstallStep::finish(ProcessResult result)
-{
-    emit progress(100, {});
-    AbstractProcessStep::finish(result);
-}
-
 QWidget *CMakeInstallStep::createConfigWidget()
 {
     auto updateDetails = [this] {