cc: Remove cheapness estimator usage from tile manager.

cc/base/switches.cc

Index: cc/base/switches.cc
diff --git a/cc/base/switches.cc b/cc/base/switches.cc
index cf2e6c5ddc4809ff4bb3ad21690886242a14cf87..48adb701e10e908020cf41fb27092eaf017d4400 100644
--- a/cc/base/switches.cc
+++ b/cc/base/switches.cc
@@ -35,7 +35,7 @@ const char kEnableRightAlignedScheduling[] = "enable-right-aligned-scheduling";
 const char kEnableTopControlsPositionCalculation[] =
     "enable-top-controls-position-calculation";
 
-// Enable solid tile color, transparent tile, and cheapness prediction metrics.
+// Enable solid tile color, transparent tile metrics.
 const char kEnablePredictionBenchmarking[] = "enable-prediction-benchmarking";
 
 // The height of the movable top controls.
@@ -62,10 +62,6 @@ const char kTraceAllRenderedFrames[] = "trace-all-rendered-frames";
 // complete, such as --slow-down-raster-scale-factor=25.
 const char kSlowDownRasterScaleFactor[] = "slow-down-raster-scale-factor";
 
-// Disable scheduling of rasterization jobs according to their estimated
-// processing cost.
-const char kDisableCheapnessEstimator[] = "disable-cheapness-estimator";
-
 // The scale factor for low resolution tile contents.
 const char kLowResolutionContentsScaleFactor[] =
     "low-resolution-contents-scale-factor";