[vr] Update assets component to 1.3

Bug: 807038
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I499028acf6ccfc8fbeb07fc32bc703593c030325
Reviewed-on: https://chromium-review.googlesource.com/892046Reviewed-by: Yash Malik <ymalik@chromium.org>
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532687}

chrome/browser/resources/vr/assets/VERSION

 MAJOR=1
-MINOR=2
+MINOR=3
\ No newline at end of file

chrome/browser/resources/vr/assets/fullscreen_gradient.png.sha1

-4945728b62a01aa712b5b0bacbf10d5a1a95bd80
+be61cbcdc981d5592455d3b7a14b97e14d3acac4
\ No newline at end of file

chrome/browser/resources/vr/assets/incognito_gradient.png.sha1

-a80f18117d1e8820404d50cdf49ba6bf6c3c69f0
+6b0e506b19b79ec1be4963a9bd92ab8b92ccca1c
\ No newline at end of file

chrome/browser/resources/vr/assets/normal_gradient.png.sha1

-9888994181e2fa6cf6b510c02f21e183ad8efc46
+bbe1145ae7778d7d50b02c54fd1bf4b62bbc04db
\ No newline at end of file