MultiSiteRefUpdateTest: remove redundant IOException

Ecipse reported the unthrown IOException declared in
the test methods: remove the exception and resolve
the associated Eclipse warning.

Change-Id: I34228c01657910cfdd671947c242599082db5f99
diff --git a/src/test/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteRefUpdateTest.java b/src/test/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteRefUpdateTest.java
index 9e75c8f..d9e5c07 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteRefUpdateTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/multisite/validation/MultiSiteRefUpdateTest.java
@@ -92,7 +92,7 @@
   }
 
   @Test
-  public void newUpdateShouldIncreaseRefUpdateFailureCountWhenFailing() throws IOException {
+  public void newUpdateShouldIncreaseRefUpdateFailureCountWhenFailing() {
 
     doReturn(false).when(sharedRefDb).isUpToDate(A_TEST_PROJECT_NAME_KEY, oldRef);
 
@@ -106,8 +106,7 @@
   }
 
   @Test
-  public void newUpdateShouldNotIncreaseSplitBrainPreventedCounterIfFailingSharedDbPostUpdate()
-      throws IOException {
+  public void newUpdateShouldNotIncreaseSplitBrainPreventedCounterIfFailingSharedDbPostUpdate() {
 
     doReturn(true).when(sharedRefDb).isUpToDate(A_TEST_PROJECT_NAME_KEY, oldRef);
     doReturn(false)
@@ -124,8 +123,7 @@
   }
 
   @Test
-  public void newUpdateShouldtIncreaseSplitBrainCounterIfFailingSharedDbPostUpdate()
-      throws IOException {
+  public void newUpdateShouldtIncreaseSplitBrainCounterIfFailingSharedDbPostUpdate() {
 
     doReturn(true).when(sharedRefDb).isUpToDate(A_TEST_PROJECT_NAME_KEY, oldRef);
     doReturn(false)
@@ -159,7 +157,7 @@
   }
 
   @Test
-  public void deleteShouldIncreaseRefUpdateFailureCountWhenFailing() throws IOException {
+  public void deleteShouldIncreaseRefUpdateFailureCountWhenFailing() {
 
     doReturn(false).when(sharedRefDb).isUpToDate(A_TEST_PROJECT_NAME_KEY, oldRef);