Remove diamond operator

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=131623598

extensions/testlib/test/com/google/inject/testing/throwingproviders/CheckedProviderSubjectTest.java

@@ -129,7 +129,7 @@ public void thrownException_gets_expectFailure() {
   }
 
   private <T, P extends CheckedProvider<T>> CheckedProviderSubject<T, P> createSubject(P provider) {
-    return new CheckedProviderSubject<>(new ThrowingFailureStrategy(), provider);
+    return new CheckedProviderSubject<T, P>(new ThrowingFailureStrategy(), provider);
   }
 
   private String getReturningProviderName(String providing) {