Pass original int64 response time when caching resource metadata.

Source/platform/network/ResourceResponse.h

Index: Source/platform/network/ResourceResponse.h
diff --git a/Source/platform/network/ResourceResponse.h b/Source/platform/network/ResourceResponse.h
index f3cf2bb8ebba4f89097a725882ef12ac247e4b62..345e3ebda030e794e7b6487fbb384a759939d06d 100644
--- a/Source/platform/network/ResourceResponse.h
+++ b/Source/platform/network/ResourceResponse.h
@@ -175,9 +175,8 @@ public:
     bool isMultipartPayload() const { return m_isMultipartPayload; }
     void setIsMultipartPayload(bool value) { m_isMultipartPayload = value; }
 
-    double responseTime() const { return m_responseTime; }
-    void setResponseTime(double responseTime) { m_responseTime = responseTime; }
-    void setResponseTime(int64 responseTime) { m_originalResponseTime = responseTime; }
+    int64 responseTime() const { return m_responseTime; }
+    void setResponseTime(int64 responseTime) { m_responseTime = responseTime; }
 
     const AtomicString& remoteIPAddress() const { return m_remoteIPAddress; }
     void setRemoteIPAddress(const AtomicString& value) { m_remoteIPAddress = value; }
@@ -281,8 +280,7 @@ private:
 
     // The time at which the response headers were received.  For cached
     // responses, this time could be "far" in the past.
-    double m_responseTime;
-    int64 m_originalResponseTime;
+    int64 m_responseTime;
 
     // Remote IP address of the socket which fetched this resource.
     AtomicString m_remoteIPAddress;
@@ -331,8 +329,7 @@ public:
     bool m_wasFallbackRequiredByServiceWorker;
     WebServiceWorkerResponseType m_serviceWorkerResponseType;
     KURL m_originalURLViaServiceWorker;
-    double m_responseTime;
-    int64 m_originalResponseTime;
+    int64 m_responseTime;
     String m_remoteIPAddress;
     unsigned short m_remotePort;
     String m_downloadedFilePath;