Revert of Add display-resolution caching to GPU IDC

cc/tiles/mipmap_util.cc

Index: cc/tiles/mipmap_util.cc
diff --git a/cc/tiles/mipmap_util.cc b/cc/tiles/mipmap_util.cc
index d0ffbc9bf8610708622d6d88d2dfdd5fa957809e..ad35d8b0cfbd6abf8060a2c34eb7a8aaf2e804d7 100644
--- a/cc/tiles/mipmap_util.cc
+++ b/cc/tiles/mipmap_util.cc
@@ -55,20 +55,12 @@
   if (src_size.width() == 0 || src_size.height() == 0 || mip_level == -1)
     return SkSize::Make(-1, -1);
 
-  gfx::Size target_size = GetSizeForLevel(src_size, mip_level);
+  gfx::Size target_size(ScaleAxisToMipLevel(src_size.width(), mip_level),
+                        ScaleAxisToMipLevel(src_size.height(), mip_level));
 
   return SkSize::Make(
       static_cast<float>(target_size.width()) / src_size.width(),
       static_cast<float>(target_size.height()) / src_size.height());
-}
-
-gfx::Size MipMapUtil::GetSizeForLevel(const gfx::Size& src_size,
-                                      int mip_level) {
-  if (src_size.width() == 0 || src_size.height() == 0 || mip_level == -1)
-    return gfx::Size(-1, -1);
-
-  return gfx::Size(ScaleAxisToMipLevel(src_size.width(), mip_level),
-                   ScaleAxisToMipLevel(src_size.height(), mip_level));
 }
 
 SkSize MipMapUtil::GetScaleAdjustmentForSize(const gfx::Size& src_size,