Remove WebTouchEvent.targetTouches

public/web/WebInputEvent.h

Index: public/web/WebInputEvent.h
diff --git a/public/web/WebInputEvent.h b/public/web/WebInputEvent.h
index 58c4a0bb39e1d8230b7d4ec08ad94a54f7d0dde5..17bb4d57a73d5dea6300d9e78318faef04624e1e 100644
--- a/public/web/WebInputEvent.h
+++ b/public/web/WebInputEvent.h
@@ -491,14 +491,11 @@ public:
     // List of all touches which are currently down.
     WebTouchPoint touches[touchesLengthCap];
 
+    // FIXME: Remove after eliminating downstream references, crbug.com/358132.
     unsigned changedTouchesLength;
     // List of all touches whose state has changed since the last WebTouchEvent
     WebTouchPoint changedTouches[touchesLengthCap];
 
-    unsigned targetTouchesLength;
-    // List of all touches which are currently down and are targeting the event recipient.
-    WebTouchPoint targetTouches[touchesLengthCap];
-
     // Whether the event can be canceled (with preventDefault). If true then the browser
     // must wait for an ACK for this event. If false then no ACK IPC is expected.
     // See comment at the top for why an int is used here instead of a bool.
@@ -508,7 +505,6 @@ public:
         : WebInputEvent(sizeof(WebTouchEvent))
         , touchesLength(0)
         , changedTouchesLength(0)
-        , targetTouchesLength(0)
         , cancelable(true)
     {
     }