Remove superfluous throws clause.

--
MOS_MIGRATED_REVID=95320780
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/FilesystemValueChecker.java b/src/main/java/com/google/devtools/build/lib/skyframe/FilesystemValueChecker.java
index a4524d1..735a5e6 100644
--- a/src/main/java/com/google/devtools/build/lib/skyframe/FilesystemValueChecker.java
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/FilesystemValueChecker.java
@@ -232,7 +232,7 @@
   }
 
   private void updateIntraBuildModifiedCounter(long time, boolean oldWasSymlink,
-      boolean newIsSymlink) throws IOException {
+      boolean newIsSymlink) {
     if (lastExecutionTimeRange != null
         && lastExecutionTimeRange.contains(time)
         && !(oldWasSymlink && newIsSymlink)) {