Use Blink's flag to prevent fling boosting.

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index 6c0fca0b55ad128fd39671c023086c843f3ea09c..c73b121a10352e1267e86adba8c79988652ba466 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -1022,6 +1022,8 @@ void ContentViewCoreImpl::FlingStart(JNIEnv* env, jobject obj, jlong time_ms,
 void ContentViewCoreImpl::FlingCancel(JNIEnv* env, jobject obj, jlong time_ms) {
   WebGestureEvent event = MakeGestureEvent(
       WebInputEvent::GestureFlingCancel, time_ms, 0, 0);
+  event.data.flingCancel.preventBoosting = true;
+
   SendGestureEvent(event);
 }