Events: Remove default getCoalescingKey impls

Summary:
Event.java's default implementation of `getCoalescingKey` returns 0. Most overrides of getCoalescingKey just return 0. Delete them.

Changelog: [Internal]

Reviewed By: mdvacca

Differential Revision: D28650792

fbshipit-source-id: 374591fb4ba2305df934de412790b3397ca2fa1c

ReactAndroid/src/main/java/com/facebook/react/views/drawer/events/DrawerClosedEvent.java

@@ -33,10 +33,4 @@ public String getEventName() {
   protected WritableMap getEventData() {
     return Arguments.createMap();
   }
-
-  @Override
-  public short getCoalescingKey() {
-    // All events for a given view can be coalesced.
-    return 0;
-  }
 }

ReactAndroid/src/main/java/com/facebook/react/views/drawer/events/DrawerOpenedEvent.java

@@ -33,10 +33,4 @@ public String getEventName() {
   protected WritableMap getEventData() {
     return Arguments.createMap();
   }
-
-  @Override
-  public short getCoalescingKey() {
-    // All events for a given view can be coalesced.
-    return 0;
-  }
 }

ReactAndroid/src/main/java/com/facebook/react/views/drawer/events/DrawerSlideEvent.java

@@ -37,12 +37,6 @@ public String getEventName() {
     return EVENT_NAME;
   }
 
-  @Override
-  public short getCoalescingKey() {
-    // All slide events for a given view can be coalesced.
-    return 0;
-  }
-
   @Override
   protected WritableMap getEventData() {
     WritableMap eventData = Arguments.createMap();

ReactAndroid/src/main/java/com/facebook/react/views/drawer/events/DrawerStateChangedEvent.java

@@ -36,12 +36,6 @@ public String getEventName() {
     return EVENT_NAME;
   }
 
-  @Override
-  public short getCoalescingKey() {
-    // All events for a given view can be coalesced.
-    return 0;
-  }
-
   @Override
   protected WritableMap getEventData() {
     WritableMap eventData = Arguments.createMap();

ReactAndroid/src/main/java/com/facebook/react/views/scroll/ScrollEvent.java

@@ -124,12 +124,6 @@ public String getEventName() {
     return ScrollEventType.getJSEventName(Assertions.assertNotNull(mScrollEventType));
   }
 
-  @Override
-  public short getCoalescingKey() {
-    // All scroll events for a given view can be coalesced
-    return 0;
-  }
-
   @Override
   public boolean canCoalesce() {
     // Only SCROLL events can be coalesced, all others can not be

ReactAndroid/src/main/java/com/facebook/react/views/slider/ReactSliderEvent.java

@@ -39,11 +39,6 @@ public String getEventName() {
     return EVENT_NAME;
   }
 
-  @Override
-  public short getCoalescingKey() {
-    return 0;
-  }
-
   @Override
   public void dispatch(RCTEventEmitter rctEventEmitter) {
     rctEventEmitter.receiveEvent(getViewTag(), getEventName(), serializeEventData());

ReactAndroid/src/main/java/com/facebook/react/views/slider/ReactSlidingCompleteEvent.java

@@ -47,11 +47,6 @@ protected WritableMap getEventData() {
     return eventData;
   }
 
-  @Override
-  public short getCoalescingKey() {
-    return 0;
-  }
-
   @Override
   public boolean canCoalesce() {
     return false;

ReactAndroid/src/main/java/com/facebook/react/views/switchview/ReactSwitchEvent.java

@@ -46,10 +46,4 @@ protected WritableMap getEventData() {
     eventData.putBoolean("value", getIsChecked());
     return eventData;
   }
-
-  @Override
-  public short getCoalescingKey() {
-    // All switch events for a given view can be coalesced.
-    return 0;
-  }
 }