Remove unused catches

Change-Id: I51a869aeb2f3a114524744cdacd1b1e7de7afb74
diff --git a/src/main/java/com/android/tools/r8/retrace/Retrace.java b/src/main/java/com/android/tools/r8/retrace/Retrace.java
index bbc053a..adf9583 100644
--- a/src/main/java/com/android/tools/r8/retrace/Retrace.java
+++ b/src/main/java/com/android/tools/r8/retrace/Retrace.java
@@ -177,10 +177,6 @@
       if (command.printTimes()) {
         timing.report();
       }
-    } catch (IOException ex) {
-      command.diagnosticsHandler.error(
-          new StringDiagnostic("Could not open mapping input stream: " + ex.getMessage()));
-      throw new RetraceAbortException();
     } catch (InvalidMappingFileException e) {
       command.diagnosticsHandler.error(new ExceptionDiagnostic(e));
       throw e;
diff --git a/src/test/java/com/android/tools/r8/utils/codeinspector/CodeInspector.java b/src/test/java/com/android/tools/r8/utils/codeinspector/CodeInspector.java
index de50f11..1772e48 100644
--- a/src/test/java/com/android/tools/r8/utils/codeinspector/CodeInspector.java
+++ b/src/test/java/com/android/tools/r8/utils/codeinspector/CodeInspector.java
@@ -464,14 +464,10 @@
   }
 
   public RetraceApi retrace() {
-    try {
-      return Retracer.create(
-          new InternalProguardMapProducer(
-              mapping == null ? ClassNameMapper.builder().build() : mapping),
-          new TestDiagnosticMessagesImpl());
-    } catch (IOException e) {
-      throw new RuntimeException(e);
-    }
+    return Retracer.create(
+        new InternalProguardMapProducer(
+            mapping == null ? ClassNameMapper.builder().build() : mapping),
+        new TestDiagnosticMessagesImpl());
   }
 
   public static class InternalProguardMapProducer