Preserve original int64 time stamp in ResourceResponse.

Source/platform/exported/WebURLResponse.cpp

Index: Source/platform/exported/WebURLResponse.cpp
diff --git a/Source/platform/exported/WebURLResponse.cpp b/Source/platform/exported/WebURLResponse.cpp
index 0bc7c4ae3d45b0174d7a7ee7dac8e444d54a7913..b445c4aac07234947800b9857459bc98bac59c28 100644
--- a/Source/platform/exported/WebURLResponse.cpp
+++ b/Source/platform/exported/WebURLResponse.cpp
@@ -159,14 +159,14 @@ void WebURLResponse::setHTTPLoadInfo(const WebHTTPLoadInfo& value)
     m_private->m_resourceResponse->setResourceLoadInfo(value);
 }
 
-double WebURLResponse::responseTime() const
+void WebURLResponse::setResponseTime(double responseTime)
 {
-    return m_private->m_resourceResponse->responseTime();
+    m_private->m_resourceResponse->setResponseTime(responseTime);
 }
 
-void WebURLResponse::setResponseTime(double responseTime)
+void WebURLResponse::setResponseTime(long long responseTime)
 {
-    m_private->m_resourceResponse->setResponseTime(responseTime);
+    m_private->m_resourceResponse->setResponseTime(static_cast<int64>(responseTime));
 }
 
 WebString WebURLResponse::mimeType() const