Actually call setPositionsForTab when in VR...

In https://chromium-review.googlesource.com/c/chromium/src/+/1042500 I
missed a commit which added a crucial line :)

TBR=tedchoc@chromium.org

Bug: 837807
Change-Id: Ibc8f4f69e86ba16cfcff223c72b64481d9289549
Reviewed-on: https://chromium-review.googlesource.com/1044754Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556161}

chrome/android/java/src/org/chromium/chrome/browser/tab/TabBrowserControlsOffsetHelper.java

@@ -190,6 +190,7 @@ public class TabBrowserControlsOffsetHelper implements VrModeObserver {
             topControlsOffset = -manager.getTopControlsHeight();
             bottomControlsOffset = manager.getBottomControlsHeight();
             topContentOffset = 0;
+            manager.setPositionsForTab(topControlsOffset, bottomControlsOffset, topContentOffset);
         } else if (toNonFullscreen) {
             manager.setPositionsForTabToNonFullscreen();
         } else {