Interface cleanup for WebGestureCurveTarget

This is the final patch in a three-part series towards early termination of
flings when scrolling is impossible, cleaning up now unused portions of the
WebGestureCurveTarget interface.

Blink patch (#1)
https://codereview.chromium.org/139493003/

Chromium patch (#2):
https://codereview.chromium.org/136173004/

Review URL: https://codereview.chromium.org/217893004

git-svn-id: svn://svn.chromium.org/blink/trunk@170887 bbb929c8-8fbe-4397-9dbb-9b2b20218538

Author: jdduke@chromium.org

Source/web/WebViewImpl.cpp

@@ -596,11 +596,6 @@ bool WebViewImpl::scrollBy(const WebFloatSize& delta, const WebFloatSize& veloci
     return false;
 }
 
-void WebViewImpl::scrollBy(const WebFloatSize& delta)
-{
-    scrollBy(delta, WebFloatSize());
-}
-
 bool WebViewImpl::handleGestureEvent(const WebGestureEvent& event)
 {
     bool eventSwallowed = false;

Source/web/WebViewImpl.h

@@ -360,7 +360,6 @@ class WebViewImpl FINAL : public WebView
 
     // WebGestureCurveTarget implementation for fling.
     virtual bool scrollBy(const WebFloatSize& delta, const WebFloatSize& velocity) OVERRIDE;
-    virtual void scrollBy(const WebFloatSize& delta) OVERRIDE;
 
     // Handles context menu events orignated via the the keyboard. These
     // include the VK_APPS virtual key and the Shift+F10 combine. Code is

public/platform/WebGestureCurveTarget.h

@@ -32,14 +32,7 @@ namespace blink {
 
 class WebGestureCurveTarget {
 public:
-    // TODO(jdduke): Make pure virtual when crrev.com/136173004 lands.
-    virtual bool scrollBy(const WebFloatSize& delta, const WebFloatSize& velocity) { return false; }
-
-    // TODO(jdduke): Remove when crrev.com/136173004 lands.
-    virtual void scrollBy(const WebFloatSize& delta) { }
-
-    // TODO(jdduke): Remove when crrev.com/136173004 lands.
-    virtual void notifyCurrentFlingVelocity(const WebFloatSize& velocity) { }
+    virtual bool scrollBy(const WebFloatSize& delta, const WebFloatSize& velocity) = 0;
 
 protected:
     virtual ~WebGestureCurveTarget() { }