cc: remove jank instead of checkerboard setting

cc/switches.cc

Index: cc/switches.cc
diff --git a/cc/switches.cc b/cc/switches.cc
index be8110025a66c73fc695d4523edd4ddeb28b79e0..a6910aa437f7880f1cec979484db07d46531524c 100644
--- a/cc/switches.cc
+++ b/cc/switches.cc
@@ -25,10 +25,6 @@ const char kEnablePinchInCompositor[]       = "enable-pinch-in-compositor";
 // Paint content on the compositor thread instead of the main thread.
 const char kImplSidePainting[] = "impl-side-painting";
 
-// When threaded compositing is turned on, wait until the entire frame has
-// content (i.e. jank) instead of showing checkerboards for missing content.
-const char kJankInsteadOfCheckerboard[] = "jank-instead-of-checkerboard";
-
 // Show metrics about overdraw in about:tracing recordings, such as the number
 // of pixels culled, and the number of pixels drawn, for each frame.
 const char kTraceOverdraw[] = "trace-overdraw";