Remove unused imports

Change-Id: Iccffdc5f56535cef71aa6ff83c4936fb6af3fff9

src/main/java/com/android/tools/r8/D8Command.java

diff --git a/src/main/java/com/android/tools/r8/D8Command.java b/src/main/java/com/android/tools/r8/D8Command.java
index 1b7ca868..70eb14e 100644
--- a/src/main/java/com/android/tools/r8/D8Command.java
+++ b/src/main/java/com/android/tools/r8/D8Command.java
@@ -6,7 +6,6 @@
 import static com.android.tools.r8.utils.InternalOptions.DETERMINISTIC_DEBUGGING;
 import static com.android.tools.r8.utils.MapConsumerUtils.wrapExistingMapConsumerIfNotNull;
 
-import com.android.tools.r8.R8Command.Builder;
 import com.android.tools.r8.dex.Marker.Tool;
 import com.android.tools.r8.dump.DumpOptions;
 import com.android.tools.r8.errors.DexFileOverflowDiagnostic;

src/main/java/com/android/tools/r8/metadata/D8BuildMetadataImpl.java

diff --git a/src/main/java/com/android/tools/r8/metadata/D8BuildMetadataImpl.java b/src/main/java/com/android/tools/r8/metadata/D8BuildMetadataImpl.java
index a55112a..7e4239e 100644
--- a/src/main/java/com/android/tools/r8/metadata/D8BuildMetadataImpl.java
+++ b/src/main/java/com/android/tools/r8/metadata/D8BuildMetadataImpl.java
@@ -8,7 +8,6 @@
 import com.android.tools.r8.keepanno.annotations.KeepConstraint;
 import com.android.tools.r8.keepanno.annotations.KeepItemKind;
 import com.android.tools.r8.keepanno.annotations.UsedByReflection;
-import com.android.tools.r8.metadata.R8BuildMetadataImpl.Builder;
 import com.google.gson.Gson;
 import com.google.gson.annotations.Expose;
 import com.google.gson.annotations.SerializedName;