Clean up a few more unused globals.

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index 5242c93c62b0c70075ebc22f57ae5c0c9b64d295..369d05d3c3fcb8312f2d7f1d5ef6ded1955b6b11 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -22,11 +22,6 @@
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/layer_tree_impl.h"
 
-namespace {
-
-// Measured in seconds.
-const double kContextRecreationTickRate = 0.03;
-
 // Measured in seconds.
 const double kSmoothnessTakesPriorityExpirationDelay = 0.25;
 
@@ -35,8 +30,6 @@ const double kCommitAndActivationDurationEstimationPercentile = 50.0;
 const double kDrawDurationEstimationPercentile = 100.0;
 const int kDrawDurationEstimatePaddingInMicroseconds = 0;
 
-}  // namespace
-
 namespace cc {
 
 struct ThreadProxy::ReadbackRequest {