Remove a duplicate "protected" from PerformanceResourceTiming

Bug: N/A
Change-Id: I160f27ba8849d61766f3790721cb04c50b9b8726
Reviewed-on: https://chromium-review.googlesource.com/1214977Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590143}

third_party/blink/renderer/core/timing/performance_resource_timing.h

@@ -93,7 +93,6 @@ class CORE_EXPORT PerformanceResourceTiming : public PerformanceEntry {
   virtual AtomicString AlpnNegotiatedProtocol() const;
   virtual AtomicString ConnectionInfo() const;
 
- protected:
   TimeTicks TimeOrigin() const { return time_origin_; }
 
  private: