Revert "[vm/io] Fix FileSystemWatcher enum name typo."

This reverts commit 0a036db.

Reason for revert: build fails on android.

Original change's description:
> [vm/io] Fix FileSystemWatcher enum name typo.
> 
> Change-Id: Ie9f2e10847caf794ddc79229ce7bd35a3909896d
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/161600
> Reviewed-by: Ryan Macnak <[email protected]>
> Commit-Queue: Alexander Aprelev <[email protected]>

[email protected],[email protected]

Change-Id: Ibffe96077dacd6f7f9c8b383703d77b416a0cf20
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/161605
Reviewed-by: Alexander Markov <[email protected]>
Commit-Queue: Alexander Markov <[email protected]>

Author: alexmarkov

runtime/bin/file_system_watcher.h

@@ -24,7 +24,7 @@ class FileSystemWatcher {
     kModifyContent = 1 << 1,
     kDelete = 1 << 2,
     kMove = 1 << 3,
-    kModifyAttribute = 1 << 4,
+    kModefyAttribute = 1 << 4,
     kDeleteSelf = 1 << 5,
     kIsDir = 1 << 6
   };

runtime/bin/file_system_watcher_android.cc

@@ -81,7 +81,7 @@ static int InotifyEventToMask(struct inotify_event* e) {
     mask |= FileSystemWatcher::kModifyContent;
   }
   if ((e->mask & IN_ATTRIB) != 0) {
-    mask |= FileSystemWatcher::kModisfyAttribute;
+    mask |= FileSystemWatcher::kModefyAttribute;
   }
   if ((e->mask & IN_CREATE) != 0) {
     mask |= FileSystemWatcher::kCreate;

runtime/bin/file_system_watcher_linux.cc

@@ -80,7 +80,7 @@ static int InotifyEventToMask(struct inotify_event* e) {
     mask |= FileSystemWatcher::kModifyContent;
   }
   if ((e->mask & IN_ATTRIB) != 0) {
-    mask |= FileSystemWatcher::kModifyAttribute;
+    mask |= FileSystemWatcher::kModefyAttribute;
   }
   if ((e->mask & IN_CREATE) != 0) {
     mask |= FileSystemWatcher::kCreate;

runtime/bin/file_system_watcher_macos.cc

@@ -358,7 +358,7 @@ Dart_Handle FileSystemWatcher::ReadEvents(intptr_t id, intptr_t path_id) {
       mask |= kModifyContent;
     }
     if ((flags & kFSEventStreamEventFlagItemXattrMod) != 0) {
-      mask |= kModifyAttribute;
+      mask |= kModefyAttribute;
     }
     if ((flags & kFSEventStreamEventFlagItemCreated) != 0) {
       mask |= kCreate;