Revert of Allow one-copy task tile worker pool to use compressed textures.

cc/resources/resource_format.cc

Index: cc/resources/resource_format.cc
diff --git a/cc/resources/resource_format.cc b/cc/resources/resource_format.cc
index e76246432ef0e7a4ad77e91404e696ad8062e49a..e11c097b04fb53cf58fc4706ddaa7ecb60beb0a4 100644
--- a/cc/resources/resource_format.cc
+++ b/cc/resources/resource_format.cc
@@ -97,36 +97,14 @@
       return gfx::BufferFormat::RGBA_4444;
     case RGBA_8888:
       return gfx::BufferFormat::RGBA_8888;
-    case ETC1:
-      return gfx::BufferFormat::ETC1;
     case ALPHA_8:
     case LUMINANCE_8:
     case RGB_565:
+    case ETC1:
       break;
   }
   NOTREACHED();
   return gfx::BufferFormat::RGBA_8888;
 }
 
-bool IsResourceFormatCompressed(ResourceFormat format) {
-  return format == ETC1;
-}
-
-bool DoesResourceFormatSupportAlpha(ResourceFormat format) {
-  switch (format) {
-    case RGBA_4444:
-    case RGBA_8888:
-    case BGRA_8888:
-    case ALPHA_8:
-      return true;
-    case LUMINANCE_8:
-    case RGB_565:
-    case ETC1:
-    case RED_8:
-      return false;
-  }
-  NOTREACHED();
-  return false;
-}
-
 }  // namespace cc