Update touch selection to only modify one selection point at a time.

content/browser/renderer_host/render_widget_host_view_android.h

Index: content/browser/renderer_host/render_widget_host_view_android.h
diff --git a/content/browser/renderer_host/render_widget_host_view_android.h b/content/browser/renderer_host/render_widget_host_view_android.h
index 7385804e556c3ac9623847e3ecf16e2e71a51575..f1d827f96fb2f2c08f3c73bd073c9f8b73e517cc 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.h
+++ b/content/browser/renderer_host/render_widget_host_view_android.h
@@ -263,8 +263,9 @@ class CONTENT_EXPORT RenderWidgetHostViewAndroid
   virtual bool SupportsAnimation() const override;
   virtual void SetNeedsAnimate() override;
   virtual void MoveCaret(const gfx::PointF& position) override;
-  virtual void SelectBetweenCoordinates(const gfx::PointF& start,
-                                        const gfx::PointF& end) override;
+  virtual void MoveRangeSelectionExtent(const gfx::PointF& extent) override;
+  virtual void SelectBetweenCoordinates(const gfx::PointF& base,
+                                        const gfx::PointF& extent) override;
   virtual void OnSelectionEvent(SelectionEventType event,
                                 const gfx::PointF& anchor_position) override;
   virtual scoped_ptr<TouchHandleDrawable> CreateDrawable() override;