Revert "Add try-with-resources scope method for timing."

This reverts commit d216cb99039366ed37906cc786f5c01d3da97442.

Reason for revert: Triggers assertion errors when the compiler is the input (b/148102986)

Change-Id: I20ea550619e2cd6b2f05f2913507b8aea173bebe

src/main/java/com/android/tools/r8/R8.java

diff --git a/src/main/java/com/android/tools/r8/R8.java b/src/main/java/com/android/tools/r8/R8.java
index 1e73572..58e68dc 100644
--- a/src/main/java/com/android/tools/r8/R8.java
+++ b/src/main/java/com/android/tools/r8/R8.java
@@ -88,7 +88,6 @@
 import com.android.tools.r8.utils.StringDiagnostic;
 import com.android.tools.r8.utils.ThreadUtils;
 import com.android.tools.r8.utils.Timing;
-import com.android.tools.r8.utils.Timing.TimingScope;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Iterables;
 import com.google.common.io.ByteStreams;
@@ -265,8 +264,9 @@
       appView.setAppServices(AppServices.builder(appView).build());
 
       List<ProguardConfigurationRule> synthesizedProguardRules = new ArrayList<>();
+      timing.begin("Strip unused code");
       Set<DexType> classesToRetainInnerClassAttributeFor = null;
-      try (TimingScope ignored = timing.scope("Strip unused code")) {
+      try {
         Set<DexType> missingClasses = appView.appInfo().getMissingClasses();
         missingClasses = filterMissingClasses(
             missingClasses, options.getProguardConfiguration().getDontWarnPatterns());
@@ -360,6 +360,9 @@
         new AnnotationRemover(appView.withLiveness(), classesToRetainInnerClassAttributeFor)
             .ensureValid()
             .run();
+
+      } finally {
+        timing.end();
       }
 
       assert appView.appInfo().hasLiveness();

src/main/java/com/android/tools/r8/utils/Timing.java

diff --git a/src/main/java/com/android/tools/r8/utils/Timing.java b/src/main/java/com/android/tools/r8/utils/Timing.java
index 5f7ef67..77df36a 100644
--- a/src/main/java/com/android/tools/r8/utils/Timing.java
+++ b/src/main/java/com/android/tools/r8/utils/Timing.java
@@ -57,8 +57,8 @@
         }
 
         @Override
-        public TimingScope scope(String title) {
-          return () -> {};
+        public void scope(String title, TimingScope fn) {
+          // Ignore.
         }
       };
 
@@ -336,14 +336,17 @@
     top.report(0, top);
   }
 
-  public TimingScope scope(String title) {
+  public void scope(String title, TimingScope fn) {
     begin(title);
-    return this::end;
+    try {
+      fn.apply();
+    } finally {
+      end();
+    }
   }
 
-  public interface TimingScope extends AutoCloseable {
-    @Override
-    void close();
+  public interface TimingScope {
+    void apply();
   }
 
   private static Map<String, MemInfo> computeMemoryInformation() {