Switch to the new client-side phishing model that uses Murmurhash for word hashes.

chrome/browser/safe_browsing/client_side_detection_service.cc

Index: chrome/browser/safe_browsing/client_side_detection_service.cc
diff --git a/chrome/browser/safe_browsing/client_side_detection_service.cc b/chrome/browser/safe_browsing/client_side_detection_service.cc
index 684391202a4618fce40babd861890a4e987ade24..9d52f0c936571a46c5a162a8f29f0a6f25672967 100644
--- a/chrome/browser/safe_browsing/client_side_detection_service.cc
+++ b/chrome/browser/safe_browsing/client_side_detection_service.cc
@@ -51,11 +51,8 @@ const base::TimeDelta ClientSideDetectionService::kPositiveCacheInterval =
 
 const char ClientSideDetectionService::kClientReportPhishingUrl[] =
     "https://sb-ssl.google.com/safebrowsing/clientreport/phishing";
-// Note: when updatng the model version, don't forget to change the filename
-// in chrome/common/chrome_constants.cc as well, or else existing users won't
-// download the new model.
 const char ClientSideDetectionService::kClientModelUrl[] =
-    "https://ssl.gstatic.com/safebrowsing/csd/client_model_v3.pb";
+    "https://ssl.gstatic.com/safebrowsing/csd/client_model_v4.pb";
 
 struct ClientSideDetectionService::ClientReportInfo {
   scoped_ptr<ClientReportPhishingRequestCallback> callback;
@@ -601,11 +598,6 @@ bool ClientSideDetectionService::ModelHasValidHashIds(
       return false;
     }
   }
-  for (int i = 0; i < model.page_word_size(); ++i) {
-    if (model.page_word(i) < 0 || model.page_word(i) > max_index) {
-      return false;
-    }
-  }
   return true;
 }