Fixes for re-enabling more MSVC level 4 warnings: chrome/ edition

chrome/renderer/safe_browsing/phishing_dom_feature_extractor.cc

Index: chrome/renderer/safe_browsing/phishing_dom_feature_extractor.cc
diff --git a/chrome/renderer/safe_browsing/phishing_dom_feature_extractor.cc b/chrome/renderer/safe_browsing/phishing_dom_feature_extractor.cc
index 65742936e50cbba1ab290baedd0ec0e3fce30d9c..821fe2edd1c231eac68e4b9bf9d0c36df545ebe1 100644
--- a/chrome/renderer/safe_browsing/phishing_dom_feature_extractor.cc
+++ b/chrome/renderer/safe_browsing/phishing_dom_feature_extractor.cc
@@ -393,7 +393,8 @@ blink::WebDocument PhishingDOMFeatureExtractor::GetNextDocument() {
   blink::WebFrame* frame = cur_document_.frame();
   // Advance to the next frame that contains a document, with no wrapping.
   if (frame) {
-    while ((frame = frame->traverseNext(false))) {
+    for (frame = frame->traverseNext(false); frame;
+         frame = frame->traverseNext(false)) {
       if (!frame->document().isNull()) {
         return frame->document();
       }