Android: Fix the aggressive pull-to-refresh triggering

https://crrev.com/c/1547547 inadvertently increased the triggering
condition for pull-to-refresh by 33%, hence causing the action to
occur when not expected by users. This CL reverts the related change.

Bug: 974823
Change-Id: I76374a6c6af187de719d40c03075f7883bc866da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1669910Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671450}

ui/android/overscroll_refresh.cc

@@ -73,7 +73,8 @@ void OverscrollRefresh::OnOverscrolled(const cc::OverscrollBehavior& behavior) {
 
   float ydelta = cumulative_scroll_.y();
   float xdelta = cumulative_scroll_.x();
-  bool in_y_direction = std::abs(ydelta) * kWeightAngle30 > std::abs(xdelta);
+  bool in_y_direction = std::abs(ydelta) > std::abs(xdelta);
+  bool in_x_direction = std::abs(ydelta) * kWeightAngle30 < std::abs(xdelta);
   OverscrollAction type = OverscrollAction::NONE;
   bool navigate_forward = false;
   if (ydelta > 0 && in_y_direction) {
@@ -84,7 +85,7 @@ void OverscrollRefresh::OnOverscrolled(const cc::OverscrollBehavior& behavior) {
       return;
     }
     type = OverscrollAction::PULL_TO_REFRESH;
-  } else if (!in_y_direction &&
+  } else if (in_x_direction &&
              (scroll_begin_x_ < edge_width_ ||
               viewport_width_ - scroll_begin_x_ < edge_width_)) {
     // Swipe-to-navigate. Check overscroll-behavior-x