Convert RuntimeEnabledFeatures.in config file to JSON format.

third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h

Index: third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
diff --git a/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h b/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
index cef1f0b3820ccc8cf036a089df88222034e40122..6fe3ee22d228830a9fb4ab8910c22259ce9c7e28 100644
--- a/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
+++ b/third_party/WebKit/Source/core/origin_trials/OriginTrialContext.h
@@ -25,7 +25,7 @@ class WebTrialTokenValidator;
 // context.  This class is not for direct use by feature implementers.
 // Instead, the OriginTrials generated namespace provides a method for each
 // trial to check if it is enabled. Experimental features must be defined in
-// RuntimeEnabledFeatures.in, which is used to generate OriginTrials.h/cpp.
+// RuntimeEnabledFeatures.json5, which is used to generate OriginTrials.h/cpp.
 //
 // Origin trials are defined by string names, provided by the implementers. The
 // framework does not maintain an enum or constant list for trial names.