Fix libpng_read_fuzzer build after the Great Blink mv.

TBR=scroggo@chromium.org
NOTRY=true
NOTREECHECKS=true

Change-Id: Ifc925b3ebf7bdccc4704da7de850d04e55df0ae2
Reviewed-on: https://chromium-review.googlesource.com/c/1350370
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610741}

third_party/libpng/BUILD.gn

@@ -126,8 +126,8 @@ if (is_win) {
 
 libpng_ossfuzz_seed_corpuses = [
   "//components/viz/test/data",
-  "//third_party/WebKit/LayoutTests/images/png-suite/samples",
-  "//third_party/WebKit/LayoutTests/images/resources/pngfuzz",
+  "//third_party/blink/web_tests/images/png-suite/samples",
+  "//third_party/blink/web_tests/resources/pngfuzz",
 ]
 
 fuzzer_test("libpng_read_fuzzer") {