Removed the redundant !this check (fix Clang's -Wundefined-bool-conversion warning)

BUG=381910
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/339173002

git-svn-id: svn://svn.chromium.org/blink/trunk@176322 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/html/HTMLElement.cpp

@@ -428,7 +428,7 @@ void HTMLElement::setOuterText(const String &text, ExceptionState& exceptionStat
         newChild = Text::create(document(), text);
 
     // textToFragment might cause mutation events.
-    if (!this || !parentNode())
+    if (!parentNode())
         exceptionState.throwDOMException(HierarchyRequestError, "The element has no parent.");
 
     if (exceptionState.hadException())