Revert "Flip enable_skia_wuffs_gif gn arg default to true"

This reverts commit b2b5cdb.

Reason for revert: Memory regression

Bug: 1036102

Original change's description:
> Flip enable_skia_wuffs_gif gn arg default to true
> 
> This is attempt chromium#2. Attempt chromium#1 (crrev.com/c/1898151) was rolled back
> (crrev.com/c/1944286) due to performance and RAM usage regressions
> (crbug.com/1023129, crbug.com/1023191).
> 
> During that time, there has been some optimization work done in the
> upstream Skia project, especially around RAM usage, so we are trying
> again.
> 
> Still, as crrev.com/c/1898151's commit message says, this change isn't
> about performance per se, it is about tracking upstream Skia.
> Nonetheless, here are some before-vs-after total times for Chromium's
> "image_decode_bench -i 10" program for x86_64, on a selection of GIF
> images that noel@chromium.org collects:
> 
> old_time  new_time  ratio file_name  file_size
> 0.000139  0.000325  0.43  bar.gif          265
> 0.000217  0.000315  0.69  radient.gif     1034
> 0.001144  0.001045  1.09  mondrian.gif    3792
> 0.002364  0.001987  1.19  rain.gif       10272
> 0.008795  0.005614  1.57  flag.gif       41738
> 0.020884  0.013044  1.60  warp.gif      106420
> 0.377886  0.286732  1.32  hex.gif      1072114
> 
> A ratio higher is better: more than 1.00 means that the new GIF decoder
> is faster than the old one.
> 
> Bug: 1014044
> Change-Id: Iba304db1ceea0661e0ca57308c2a68b2c48297a8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1958292
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Commit-Queue: Nigel Tao <nigeltao@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#724020}

TBR=scroggo@chromium.org,thakis@chromium.org,nigeltao@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1014044
Change-Id: I534ccd36a76fe5a7a357fd0cce2988869f8a4d09
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1987290
Reviewed-by: Leon Scroggins <scroggo@chromium.org>
Commit-Queue: Leon Scroggins <scroggo@chromium.org>
Auto-Submit: Leon Scroggins <scroggo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729064}

skia/BUILD.gn

@@ -27,11 +27,7 @@ skia_support_pdf = !is_ios && enable_basic_printing
 skia_support_skottie = true
 
 declare_args() {
-  # If, in the future, this configuration option is deleted entirely, we can
-  # also probably delete any mention of the "libgifcodec" third party library
-  # from the top level DEPS and the third_party/.gitignore files.
-  enable_skia_wuffs_gif = true
-
+  enable_skia_wuffs_gif = false
   skia_whitelist_serialized_typefaces = false
 }