Non-Oilpan Memory: Fix HTMLViewSourceDocument and WebLeakDetector.

Source/web/WebLeakDetector.cpp

Index: Source/web/WebLeakDetector.cpp
diff --git a/Source/web/WebLeakDetector.cpp b/Source/web/WebLeakDetector.cpp
index 27b9ddf123875086258eb240b2a83f1badcbdd41..72b85fac0a9773b54c954dfadc8496f62b99f660 100644
--- a/Source/web/WebLeakDetector.cpp
+++ b/Source/web/WebLeakDetector.cpp
@@ -103,6 +103,8 @@ void WebLeakDetectorImpl::collectGarbageAndGetDOMCounts(WebLocalFrame* frame)
     V8GCController::collectAllGarbageForTesting(isolate);
     // Note: Oilpan precise GC is scheduled at the end of the event loop.
 
+    V8PerIsolateData::from(isolate)->clearScriptRegexpContext();
+
     // Task queue may contain delayed object destruction tasks.
     // This method is called from navigation hook inside FrameLoader,
     // so previous document is still held by the loader until the next event loop.