TestResult: Devirtualize the class - part 2 of 5

Step 2 - implement findTestItemHook.

Change-Id: Iabc843740343e549f79b02f74f94f5b1b4713af3
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/autotest/boost/boosttestresult.h

@@ -17,9 +17,7 @@ public:
                     const QString &testCaseName = {}, const QString &testSuiteName = {});
 
     bool isDirectParentOf(const TestResult *other, bool *needsIntermediate) const override;
-    const ITestTreeItem * findTestTreeItem() const override;
 private:
-    bool matches(const BoostTestTreeItem *item) const;
 
     Utils::FilePath m_projectFile;
     QString m_testCaseName;