Integrate SiteEngagementEvictionPolicy with QuotaManager.

chrome/browser/engagement/site_engagement_eviction_policy.h

Index: chrome/browser/engagement/site_engagement_eviction_policy.h
diff --git a/chrome/browser/engagement/site_engagement_eviction_policy.h b/chrome/browser/engagement/site_engagement_eviction_policy.h
index 470b0ec33d2e617ca8527dedc75540081b74f7e0..60c876830b2784e4e1654bc73808b8e351307c1a 100644
--- a/chrome/browser/engagement/site_engagement_eviction_policy.h
+++ b/chrome/browser/engagement/site_engagement_eviction_policy.h
@@ -23,7 +23,7 @@ class SiteEngagementEvictionPolicy : public storage::QuotaEvictionPolicy {
  public:
   explicit SiteEngagementEvictionPolicy(
       content::BrowserContext* browser_context);
-  virtual ~SiteEngagementEvictionPolicy();
+  ~SiteEngagementEvictionPolicy() override;
 
   // Overridden from storage::QuotaEvictionPolicy:
   void GetEvictionOrigin(const scoped_refptr<storage::SpecialStoragePolicy>&
@@ -35,14 +35,14 @@ class SiteEngagementEvictionPolicy : public storage::QuotaEvictionPolicy {
  private:
   friend class SiteEngagementEvictionPolicyTest;
 
-  static GURL CalculateEvictionOrigin(
+  static GURL CalculateEvictionOriginForTests(
       const scoped_refptr<storage::SpecialStoragePolicy>&
           special_storage_policy,
       SiteEngagementScoreProvider* score_provider,
       const std::map<GURL, int64>& usage_map,
       int64 global_quota);
 
-  content::BrowserContext* browser_context_;
+  content::BrowserContext* const browser_context_;
 
   DISALLOW_COPY_AND_ASSIGN(SiteEngagementEvictionPolicy);
 };