Remove Resource::CurrentAge and Resource::FreshnessLifetime

They are not used by anyone.

BUG=None

Review-Url: https://codereview.chromium.org/2846793002
Cr-Commit-Position: refs/heads/master@{#467906}

third_party/WebKit/Source/platform/loader/fetch/Resource.cpp

@@ -493,10 +493,6 @@ static double CurrentAge(const ResourceResponse& response,
   return corrected_received_age + resident_time;
 }
 
-double Resource::CurrentAge() const {
-  return blink::CurrentAge(GetResponse(), response_timestamp_);
-}
-
 static double FreshnessLifetime(const ResourceResponse& response,
                                 double response_timestamp) {
 #if !OS(ANDROID)
@@ -528,10 +524,6 @@ static double FreshnessLifetime(const ResourceResponse& response,
   return 0;
 }
 
-double Resource::FreshnessLifetime() const {
-  return blink::FreshnessLifetime(GetResponse(), response_timestamp_);
-}
-
 static bool CanUseResponse(const ResourceResponse& response,
                            double response_timestamp) {
   if (response.IsNull())

third_party/WebKit/Source/platform/loader/fetch/Resource.h

@@ -282,9 +282,6 @@ class PLATFORM_EXPORT Resource : public GarbageCollectedFinalized<Resource>,
   }
   bool MustRefetchDueToIntegrityMetadata(const FetchParameters&) const;
 
-  double CurrentAge() const;
-  double FreshnessLifetime() const;
-
   bool IsAlive() const { return is_alive_; }
 
   void SetCacheIdentifier(const String& cache_identifier) {