[vr] Make audio more quiet

Bug: 821126
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I3fcb54a054c66184a0e6f6e54d5139ddd7346441
Reviewed-on: https://chromium-review.googlesource.com/967363Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543844}

chrome/browser/resources/vr/assets/VERSION

 MAJOR=2
-MINOR=0
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+MINOR=1
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chrome/browser/resources/vr/assets/google_chrome/back_button_click.wav.sha1

-386f2aa1ef2d9f7464f15e9d0ce3d9bacf2138fe
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+739b9d5d9d6671242b79ce0b5ccfb8b4d9a7eb4a
\ No newline at end of file

chrome/browser/resources/vr/assets/google_chrome/button_click.wav.sha1

-45bb0252f7d82e6297a149f33314e01a7f329f40
\ No newline at end of file
+ee6bfbbcc1ea33e6ff448820fadc91bd53f562a0
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chrome/browser/resources/vr/assets/google_chrome/button_hover.wav.sha1

-bba1d3c97ffc3962676af1c494f7776e63964cb7
\ No newline at end of file
+e4089035e81c181d98bc7aeaa9e3c6607a8f7cf4
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