Fix valgrind failures in PhishingTermFeatureExtractor and remove supressions for said failures.

chrome/renderer/safe_browsing/phishing_term_feature_extractor.cc

Index: chrome/renderer/safe_browsing/phishing_term_feature_extractor.cc
diff --git a/chrome/renderer/safe_browsing/phishing_term_feature_extractor.cc b/chrome/renderer/safe_browsing/phishing_term_feature_extractor.cc
index 3b4ba85ea3f87bbd8ad20e4ef233de583d4d46a9..2c4c9902f7fdfbb3ec62dc7772e5cf3764f360e0 100644
--- a/chrome/renderer/safe_browsing/phishing_term_feature_extractor.cc
+++ b/chrome/renderer/safe_browsing/phishing_term_feature_extractor.cc
@@ -177,6 +177,7 @@ void PhishingTermFeatureExtractor::ExtractFeaturesWithTimeout() {
         DLOG(ERROR) << "Feature extraction took too long, giving up";
         // We expect this to happen infrequently, so record when it does.
         UMA_HISTOGRAM_COUNTS("SBClientPhishing.TermFeatureTimeout", 1);
+        negative_word_cache_.Clear();
         RunCallback(false);
         return;
       }