[Signin][Android] Remove redundant scroll offset in bottom sheet

This CL removes redundant scrolling offset implementation in web
sign-in bottom sheet.

Bug: 1093795
Change-Id: I2b1e87e56a1b0b62ef237b7dad6c168143294aa7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333836Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Alice Wang <aliceywang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795859}

chrome/android/java/src/org/chromium/chrome/browser/signin/account_picker/AccountPickerBottomSheetView.java

@@ -122,7 +122,7 @@ class AccountPickerBottomSheetView implements BottomSheetContent {
 
     @Override
     public int getVerticalScrollOffset() {
-        return mAccountListView.computeVerticalScrollOffset();
+        return 0;
     }
 
     @Override