components/arc/vea: remove invalid Next MinVersion statement

Next MinVersion should be used per-file, not per-interface.

BUG=None
TEST=Chromium builds.

Change-Id: Ib437263f070957eec532e8876e6fd14fe4c4b548
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071464
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811594}

components/arc/mojom/video_encode_accelerator.mojom

@@ -158,7 +158,6 @@ interface VideoEncodeAccelerator {
 // Interface for clients that use VideoEncodeAccelerator. These callbacks will
 // not be made unless VideoEncodeAccelerator::Initialize() has returned
 // successfully.
-// Next MinVersion: 1
 // Next Method ID: 3
 interface VideoEncodeClient {
   // Callback to tell the client what size of frames and buffers to provide