Fixing TestRunner::findString() so as to fix findString.html editing

Source/testing/runner/TestRunner.cpp

Index: Source/testing/runner/TestRunner.cpp
diff --git a/Source/testing/runner/TestRunner.cpp b/Source/testing/runner/TestRunner.cpp
index deb4c40f8a7ac11ae827d5c2eb6135e8e8e59fcc..a7d0025c42d215193186a0f1f4daf344e044979b 100644
--- a/Source/testing/runner/TestRunner.cpp
+++ b/Source/testing/runner/TestRunner.cpp
@@ -1337,6 +1337,7 @@ void TestRunner::findString(const CppArgumentList& arguments, CppVariant* result
 
     WebFrame* frame = m_webView->mainFrame();
     const bool findResult = frame->find(0, cppVariantToWebString(arguments[0]), findOptions, wrapAround, 0);
+    frame->stopFinding(false);
     result->set(findResult);
 }