Allows prefetch requests to live beyond the renderer by delaying

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index a21c092cadea195b305214f5e96e411cd1e1359c..b053fb51d1630c53b2dd03738d208d4c422c3e22 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -63,6 +63,10 @@ const char kDebugPluginLoading[] = "debug-plugin-loading";
 const char kDefaultTileWidth[]              = "default-tile-width";
 const char kDefaultTileHeight[]             = "default-tile-height";
 
+// Delay canceling prefetches for a few seconds so that navigation events
+// don't immediately drop an in-flight prefetch.
+const char kDelayPrefetchCancellation[] = "delay-prefetch-cancellation";
+
 // Disable antialiasing on 2d canvas.
 const char kDisable2dCanvasAntialiasing[]   = "disable-canvas-aa";