Implement direction-specific touch-action values.

Now that change https://codereview.chromium.org/1137483003/ has landed
fix up change (https://codereview.chromium.org/1131093002/) by removing
the #if 0 and static casts.

This change doesn't provide an implementation of touch-action
because it has previously landed. But it activates
the code paths because now pan-left/pan-right/pan-up/pan-down
are passed transformed correctly between the blink and content
APIs.

BUG=476556
TEST=content_unittests

Review URL: https://codereview.chromium.org/1137153003

Cr-Commit-Position: refs/heads/master@{#330525}

content/renderer/render_widget.cc

@@ -2342,10 +2342,6 @@ void RenderWidget::setTouchAction(
   if (handling_event_type_ != WebInputEvent::TouchStart)
     return;
 
-// TODO(dtapuska): A dependant change needs to land in blink to change
-// the blink::WebTouchAction enum; in the meantime don't do
-// a static cast between the values. (http://crbug.com/476556)
-#if 0
   // Verify the same values are used by the types so we can cast between them.
    STATIC_ASSERT_WTI_ENUM_MATCH(Auto,      AUTO);
    STATIC_ASSERT_WTI_ENUM_MATCH(None,      NONE);
@@ -2359,18 +2355,6 @@ void RenderWidget::setTouchAction(
 
    content::TouchAction content_touch_action =
        static_cast<content::TouchAction>(web_touch_action);
-#else
-  content::TouchAction content_touch_action = TOUCH_ACTION_AUTO;
-  if (web_touch_action & blink::WebTouchActionNone)
-    content_touch_action |= TOUCH_ACTION_NONE;
-  if (web_touch_action & blink::WebTouchActionPanX)
-    content_touch_action |= TOUCH_ACTION_PAN_X;
-  if (web_touch_action & blink::WebTouchActionPanY)
-    content_touch_action |= TOUCH_ACTION_PAN_Y;
-  if (web_touch_action & blink::WebTouchActionPinchZoom)
-    content_touch_action |= TOUCH_ACTION_PINCH_ZOOM;
-
-#endif
   Send(new InputHostMsg_SetTouchAction(routing_id_, content_touch_action));
 }