Remove prefixed Resource Timing buffer management API

third_party/WebKit/Source/core/timing/Performance.idl

Index: third_party/WebKit/Source/core/timing/Performance.idl
diff --git a/third_party/WebKit/Source/core/timing/Performance.idl b/third_party/WebKit/Source/core/timing/Performance.idl
index bfe27d59c1af6f4ba218339a13fae22fab82eea3..0140c467683caa783492acf2007d5ee7e4c56f1d 100644
--- a/third_party/WebKit/Source/core/timing/Performance.idl
+++ b/third_party/WebKit/Source/core/timing/Performance.idl
@@ -51,11 +51,6 @@ interface Performance : EventTarget {
     void setResourceTimingBufferSize(unsigned long maxSize);
     attribute EventHandler onresourcetimingbufferfull;
 
-    // TODO(ksakamoto): Remove these prefixed APIs.
-    [DeprecateAs=PrefixedPerformanceClearResourceTimings, ImplementedAs=clearResourceTimings] void webkitClearResourceTimings();
-    [DeprecateAs=PrefixedPerformanceSetResourceTimingBufferSize, ImplementedAs=setResourceTimingBufferSize] void webkitSetResourceTimingBufferSize(unsigned long maxSize);
-    [DeprecateAs=PrefixedPerformanceResourceTimingBufferFull] attribute EventHandler onwebkitresourcetimingbufferfull;
-
     // Navigation Timing
     // https://w3c.github.io/navigation-timing/#extensions-to-the-performance-interface
     [SameObject, Measure] readonly attribute PerformanceTiming timing;