Make tile size a function of the device scale factor.

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 f93c0a913aa65296f6d692a829157af28a13dbb7..dc60e8b8e2d76bf80fae1d1f7a39a728e1723c24 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -71,10 +71,6 @@ const char kBrowserSubprocessPath[]         = "browser-subprocess-path";
 const char kUseCrossProcessFramesForGuests[]   =
     "use-cross-process-frames-for-guests";
 
-// Sets the tile size used by composited layers.
-const char kDefaultTileWidth[]              = "default-tile-width";
-const char kDefaultTileHeight[]             = "default-tile-height";
-
 // Disable antialiasing on 2d canvas.
 const char kDisable2dCanvasAntialiasing[]   = "disable-canvas-aa";
 
@@ -626,10 +622,6 @@ const char kLogNetLog[]                     = "log-net-log";
 const char kMainFrameResizesAreOrientationChanges[] =
     "main-frame-resizes-are-orientation-changes";
 
-// Sets the width and height above which a composited layer will get tiled.
-const char kMaxUntiledLayerHeight[]         = "max-untiled-layer-height";
-const char kMaxUntiledLayerWidth[]          = "max-untiled-layer-width";
-
 // Sample memory usage with high frequency and store the results to the
 // Renderer.Memory histogram. Used in memory tests.
 const char kMemoryMetrics[]                 = "memory-metrics";