Remove assert for unsupported SemanticsEvents (flutter#5349)

Not all platforms are expected to handle all SemanticsEvents. Therefore, it is ok to just drop unsupported events on the floor.
Eistrong · May 23, 2018 · 47f4a2a · 47f4a2a
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commit 47f4a2a
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diff --git a/shell/platform/android/io/flutter/view/AccessibilityBridge.java b/shell/platform/android/io/flutter/view/AccessibilityBridge.java
@@ -691,8 +691,6 @@ public void onMessage(Object message, BasicMessageChannel.Reply<Object> reply) {
                 e.getText().add((String) data.get("message"));
                 sendAccessibilityEvent(e);
             }
-            default:
-                assert false;
         }
     }
 

diff --git a/shell/platform/darwin/ios/framework/Source/accessibility_bridge.mm b/shell/platform/darwin/ios/framework/Source/accessibility_bridge.mm
@@ -614,8 +614,6 @@ - (BOOL)accessibilityScroll:(UIAccessibilityScrollDirection)direction {
   if ([type isEqualToString:@"announce"]) {
     NSString* message = annotatedEvent[@"data"][@"message"];
     UIAccessibilityPostNotification(UIAccessibilityAnnouncementNotification, message);
-  } else {
-    NSCAssert(NO, @"Invalid event type %@", type);
   }
 }