Revert of Fix (or tag) uses of explicit '64' instead of GL_MAILBOX_SIZE_CHROMIUM

cc/trees/layer_tree_host_unittest_delegated.cc

Index: cc/trees/layer_tree_host_unittest_delegated.cc
diff --git a/cc/trees/layer_tree_host_unittest_delegated.cc b/cc/trees/layer_tree_host_unittest_delegated.cc
index 7fe0eced8ee21b5de64efe3670ac62857aad1757..a820606e1fb175b1a8aafa30b7ec8527ce0a3c20 100644
--- a/cc/trees/layer_tree_host_unittest_delegated.cc
+++ b/cc/trees/layer_tree_host_unittest_delegated.cc
@@ -136,10 +136,12 @@
     TransferableResource resource;
     resource.id = resource_id;
     resource.mailbox_holder.texture_target = GL_TEXTURE_2D;
-    GLbyte arbitrary_mailbox[GL_MAILBOX_SIZE_CHROMIUM] = {
-        1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2,
-        3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4,
-        5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4};
+    GLbyte arbitrary_mailbox[64] = {
+      1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0,
+      1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0,
+      1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0,
+      1, 2, 3, 4
+    };
     resource.mailbox_holder.mailbox.SetName(arbitrary_mailbox);
     frame->resource_list.push_back(resource);
   }