Revert usage of FirebaseInitProvider in unit test

Author: tejasd

firebase-perf/src/test/java/com/google/firebase/perf/config/RemoteConfigManagerTest.java

@@ -28,7 +28,6 @@
 import com.google.common.util.concurrent.MoreExecutors;
 import com.google.firebase.inject.Provider;
 import com.google.firebase.perf.FirebasePerformanceTestBase;
-import com.google.firebase.provider.FirebaseInitProvider;
 import com.google.firebase.remoteconfig.FirebaseRemoteConfig;
 import com.google.firebase.remoteconfig.FirebaseRemoteConfigInfo;
 import com.google.firebase.remoteconfig.FirebaseRemoteConfigSettings;
@@ -847,7 +846,7 @@ public void triggerRemoteConfigFetchIfNecessary_doesNotFetchBeforeAppStartRandom
                 appStartConfigFetchDelay));
 
     // Simulate time fast forward to some time before fetch time is up
-    long appStartTimeInMs = FirebaseInitProvider.getStartupTime().getEpochMillis();
+    long appStartTimeInMs = System.currentTimeMillis();
     when(remoteConfigManagerPartialMock.getCurrentSystemTimeMillis())
         .thenReturn(appStartTimeInMs + appStartConfigFetchDelay - 2000);