Revert of Revert of Early terminate flings when scrolling impossible

content/child/touch_fling_gesture_curve_unittest.cc

Index: content/child/touch_fling_gesture_curve_unittest.cc
diff --git a/content/child/touch_fling_gesture_curve_unittest.cc b/content/child/touch_fling_gesture_curve_unittest.cc
index 872f1ef99efef181f8ad7390c72567064670ca85..9c42e638d569ea0a87acd48a292d12d042912239 100644
--- a/content/child/touch_fling_gesture_curve_unittest.cc
+++ b/content/child/touch_fling_gesture_curve_unittest.cc
@@ -24,13 +24,12 @@
 
 class MockGestureCurveTarget : public WebGestureCurveTarget {
  public:
-  virtual void scrollBy(const WebFloatSize& delta) {
+  virtual bool scrollBy(const WebFloatSize& delta,
+                        const WebFloatSize& velocity) OVERRIDE {
     cumulative_delta_.width += delta.width;
     cumulative_delta_.height += delta.height;
-  }
-
-  virtual void notifyCurrentFlingVelocity(const WebFloatSize& velocity) {
     current_velocity_ = velocity;
+    return true;
   }
 
   WebFloatSize cumulative_delta() const { return cumulative_delta_; }