7 files changed, 10 insertions, 23 deletions
diff --git a/dom/performance/Performance.cpp b/dom/performance/Performance.cpp
index d1547dc065..8f6a61c85c 100755
--- a/dom/performance/Performance.cpp
+++ b/dom/performance/Performance.cpp
@@ -121,6 +121,13 @@ Performance::~Performance()
 {}
 
 DOMHighResTimeStamp
+Performance::Now() const
+{
+  TimeDuration duration = TimeStamp::Now() - CreationTimeStamp();
+  return RoundTime(duration.ToMilliseconds());
+}
+
+DOMHighResTimeStamp
 Performance::TimeOrigin()
 {
   if (!mPerformanceService) {
diff --git a/dom/performance/Performance.h b/dom/performance/Performance.h
index 8495235a28..32c689c6e3 100644
--- a/dom/performance/Performance.h
+++ b/dom/performance/Performance.h
@@ -68,7 +68,7 @@ public:
 
   void ClearResourceTimings();
 
-  virtual DOMHighResTimeStamp Now() const = 0;
+  DOMHighResTimeStamp Now() const;
 
   DOMHighResTimeStamp TimeOrigin();
 
diff --git a/dom/performance/PerformanceMainThread.cpp b/dom/performance/PerformanceMainThread.cpp
index d67c0c906e..5eac15afdb 100644
--- a/dom/performance/PerformanceMainThread.cpp
+++ b/dom/performance/PerformanceMainThread.cpp
@@ -105,12 +105,6 @@ PerformanceMainThread::Navigation()
   return mNavigation;
 }
 
-DOMHighResTimeStamp
-PerformanceMainThread::Now() const
-{
-  return RoundTime(GetDOMTiming()->TimeStampToDOMHighRes(TimeStamp::Now()));
-}
-
 /**
  * An entry should be added only after the resource is loaded.
  * This method is not thread safe and can only be called on the main thread.
diff --git a/dom/performance/PerformanceMainThread.h b/dom/performance/PerformanceMainThread.h
index fcaa6b9033..c5f8887a40 100644
--- a/dom/performance/PerformanceMainThread.h
+++ b/dom/performance/PerformanceMainThread.h
@@ -23,9 +23,6 @@ public:
   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(PerformanceMainThread,
                                                          Performance)
 
-  // Performance WebIDL methods
-  DOMHighResTimeStamp Now() const override;
-
   virtual PerformanceTiming* Timing() override;
 
   virtual PerformanceNavigation* Navigation() override;
diff --git a/dom/performance/PerformanceWorker.cpp b/dom/performance/PerformanceWorker.cpp
index db9d6aa6e9..17820d4347 100644
--- a/dom/performance/PerformanceWorker.cpp
+++ b/dom/performance/PerformanceWorker.cpp
@@ -23,14 +23,6 @@ PerformanceWorker::~PerformanceWorker()
   mWorkerPrivate->AssertIsOnWorkerThread();
 }
 
-DOMHighResTimeStamp
-PerformanceWorker::Now() const
-{
-  TimeDuration duration =
-    TimeStamp::Now() - mWorkerPrivate->NowBaseTimeStamp();
-  return RoundTime(duration.ToMilliseconds());
-}
-
 void
 PerformanceWorker::InsertUserEntry(PerformanceEntry* aEntry)
 {
diff --git a/dom/performance/PerformanceWorker.h b/dom/performance/PerformanceWorker.h
index 89bfea3edb..346bdd0260 100644
--- a/dom/performance/PerformanceWorker.h
+++ b/dom/performance/PerformanceWorker.h
@@ -21,9 +21,6 @@ class PerformanceWorker final : public Performance
 public:
   explicit PerformanceWorker(workers::WorkerPrivate* aWorkerPrivate);
 
-  // Performance WebIDL methods
-  DOMHighResTimeStamp Now() const override;
-
   virtual PerformanceTiming* Timing() override
   {
     MOZ_CRASH("This should not be called on workers.");
diff --git a/dom/performance/tests/test_timeOrigin.html b/dom/performance/tests/test_timeOrigin.html
index 73c5106f4b..5a8a461f30 100644
--- a/dom/performance/tests/test_timeOrigin.html
+++ b/dom/performance/tests/test_timeOrigin.html
@@ -32,7 +32,7 @@ function testWorker() {
                       { type: "text/javascript" });
   var w = new Worker(URL.createObjectURL(blob));
   w.onmessage = function(e) {
-    ok (e.data.now + e.data.timeOrigin > now + performance.timeOrigin, "Comparing worker.now and window.now");
+    ok (e.now + e.timeOrigin > now + performance.now, "Comparing worker.now and window.now");
     next();
   }
 }
@@ -44,7 +44,7 @@ function testSharedWorker() {
                       { type: "text/javascript" });
   var w = new SharedWorker(URL.createObjectURL(blob));
   w.port.onmessage = function(e) {
-    ok (e.data.now + e.data.timeOrigin > now + performance.timeOrigin, "Comparing worker.now and window.now");
+    ok (e.now + e.timeOrigin > now + performance.now, "Comparing worker.now and window.now");
     next();
   }
 }