Revert unintended changes to e/r/a/automation_position.cc

TBR=dtseng@chromium.org

Change-Id: I299c2905122c06a0cb5492545a8d7a695fc81e18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042275Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739083}

extensions/renderer/api/automation/automation_position.cc

@@ -248,8 +248,7 @@ void AutomationPosition::MoveToPositionAtEndOfDocument(
 }
 
 void AutomationPosition::MoveToParentPosition(gin::Arguments* arguments) {
-  position_ = position_->CreateParentPosition()->AsUnignoredPosition(
-      ui::AXPositionAdjustmentBehavior::kMoveBackwards);
+  position_ = position_->CreateParentPosition();
 }
 
 void AutomationPosition::MoveToNextLeafTreePosition(gin::Arguments* arguments) {