Add victorvianna@ to components/sync/OWNERS

Bug: None
Change-Id: I989bed9f38ab5528d92cb9196026d6b2c2b4e544
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2431104
Commit-Queue: Victor Vianna <victorvianna@google.com>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Auto-Submit: Victor Vianna <victorvianna@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810559}

components/sync/OWNERS

@@ -5,5 +5,6 @@ mmoskvitin@google.com
 rushans@google.com
 treib@chromium.org
 tschumann@chromium.org
+victorvianna@google.com
 
 # COMPONENT: Services>Sync