Prevent droiddoc from printing running time.

Test: m -j docs;
Bug: b/116874473
Change-Id: I4b6bac1225a2a7cc8b9b6ec46bd5362436466843
diff --git a/src/com/google/doclava/Doclava.java b/src/com/google/doclava/Doclava.java
index fbde7d8..53afe55 100644
--- a/src/com/google/doclava/Doclava.java
+++ b/src/com/google/doclava/Doclava.java
@@ -173,7 +173,6 @@
   }
 
   public static boolean start(RootDoc r) {
-    long startTime = System.nanoTime();
     String keepListFile = null;
     String proguardFile = null;
     String proofreadFile = null;
@@ -574,10 +573,6 @@
 
     Errors.printErrors();
 
-    long time = System.nanoTime() - startTime;
-    System.out.println("DroidDoc took " + (time / 1000000000) + " sec. to write docs to "
-        + outputPathBase );
-
     return !Errors.hadError;
   }