The optional Malware Details also collects HTTP cache information. See design...

chrome/browser/safe_browsing/safe_browsing_blocking_page_unittest.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/safe_browsing/malware_details.h"
 #include "chrome/browser/safe_browsing/safe_browsing_blocking_page.h"
 #include "chrome/common/pref_names.h"
@@ skipping 20 matching lines @@
 
   // Overriden from InterstitialPage.  Don't create a view.
   virtual TabContentsView* CreateTabContentsView() {
     return NULL;
   }
 };
 
 class TestSafeBrowsingService: public SafeBrowsingService {
  public:
   virtual ~TestSafeBrowsingService() {}
-  virtual void ReportMalwareDetails(scoped_refptr<MalwareDetails> details) {
-    details_.push_back(details);
+
+  virtual void SendSerializedMalwareDetails(const std::string& serialized) {
+    details_.push_back(serialized);
   }
 
-  std::list<scoped_refptr<MalwareDetails> >* GetDetails() {
+  std::list<std::string>* GetDetails() {
     return &details_;
   }
 
-  std::list<scoped_refptr<MalwareDetails> > details_;
+  std::list<std::string> details_;
 };
 
 class TestSafeBrowsingBlockingPageFactory
     : public SafeBrowsingBlockingPageFactory {
  public:
   TestSafeBrowsingBlockingPageFactory() { }
   ~TestSafeBrowsingBlockingPageFactory() { }
 
   virtual SafeBrowsingBlockingPage* CreateSafeBrowsingPage(
       SafeBrowsingService* service,
@@ skipping 517 matching lines @@
 
   EXPECT_TRUE(contents()->profile()->GetPrefs()->GetBoolean(
       prefs::kSafeBrowsingReportingEnabled));
 
   // Simulate the user uncheck the report agreement checkbox.
   sb_interstitial->SetReportingPreference(false);
 
   EXPECT_FALSE(contents()->profile()->GetPrefs()->GetBoolean(
       prefs::kSafeBrowsingReportingEnabled));
 }