Remove StaleWhileRevalidateCacheControl feature.

This feature will not be used in Blink in the immediate future, so
remove it.

There are no callers or users.

BUG=348877
TEST=compiled

Review URL: https://codereview.chromium.org/1325613002

git-svn-id: svn://svn.chromium.org/blink/trunk@201546 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in

@@ -152,7 +152,6 @@ SlimmingPaint status=stable
 SlimmingPaintV2 depends_on=SlimmingPaint
 SlimmingPaintUnderInvalidationChecking depends_on=SlimmingPaint
 SlimmingPaintStrictCullRectClipping depends_on=SlimmingPaint
-StaleWhileRevalidateCacheControl
 // Do not turn this flag into stable, because many interfaces that should not
 // be shipped would be enabled. Instead, remove the flag from the shipping
 // interface.

third_party/WebKit/Source/web/WebRuntimeFeatures.cpp

@@ -309,11 +309,6 @@ void WebRuntimeFeatures::enablePushMessagingData(bool enable)
     RuntimeEnabledFeatures::setPushMessagingDataEnabled(enable);
 }
 
-void WebRuntimeFeatures::enableStaleWhileRevalidateCacheControl(bool enable)
-{
-    RuntimeEnabledFeatures::setStaleWhileRevalidateCacheControlEnabled(enable);
-}
-
 void WebRuntimeFeatures::enableUnsafeES3APIs(bool enable)
 {
     RuntimeEnabledFeatures::setUnsafeES3APIsEnabled(enable);

third_party/WebKit/public/web/WebRuntimeFeatures.h

@@ -158,8 +158,6 @@ public:
 
     BLINK_EXPORT static void enablePushMessagingHasPermission(bool);
 
-    BLINK_EXPORT static void enableStaleWhileRevalidateCacheControl(bool);
-
     BLINK_EXPORT static void enableUnsafeES3APIs(bool);
 
     BLINK_EXPORT static void enableWebVR(bool);