Remove unused imports from D8 and R8

Change-Id: I31a020cc56b596ffa0bbf12d95d93ba251d47045
diff --git a/src/main/java/com/android/tools/r8/D8.java b/src/main/java/com/android/tools/r8/D8.java
index 1296383..85abb47 100644
--- a/src/main/java/com/android/tools/r8/D8.java
+++ b/src/main/java/com/android/tools/r8/D8.java
@@ -21,7 +21,6 @@
 import com.android.tools.r8.ir.desugar.PrefixRewritingMapper;
 import com.android.tools.r8.ir.optimize.AssertionsRewriter;
 import com.android.tools.r8.ir.optimize.info.OptimizationFeedbackSimple;
-import com.android.tools.r8.ir.optimize.library.LibraryOptimizationInfoInitializer;
 import com.android.tools.r8.naming.PrefixRewritingNamingLens;
 import com.android.tools.r8.origin.CommandLineOrigin;
 import com.android.tools.r8.utils.AndroidApp;
diff --git a/src/main/java/com/android/tools/r8/R8.java b/src/main/java/com/android/tools/r8/R8.java
index 622de95..7db3d7c 100644
--- a/src/main/java/com/android/tools/r8/R8.java
+++ b/src/main/java/com/android/tools/r8/R8.java
@@ -44,7 +44,6 @@
 import com.android.tools.r8.ir.optimize.UnusedArgumentsCollector;
 import com.android.tools.r8.ir.optimize.UnusedArgumentsCollector.UnusedArgumentsGraphLense;
 import com.android.tools.r8.ir.optimize.info.OptimizationFeedbackSimple;
-import com.android.tools.r8.ir.optimize.library.LibraryOptimizationInfoInitializer;
 import com.android.tools.r8.jar.CfApplicationWriter;
 import com.android.tools.r8.kotlin.Kotlin;
 import com.android.tools.r8.kotlin.KotlinInfo;