Remove unnecessary `explicit` qualifiers on constructors.

Change-Id: Id12e392ad50f66a6e2251a68662b7959315dc567
diff --git a/compiler/dex/pass_driver_me_opts.h b/compiler/dex/pass_driver_me_opts.h
index e94c189..c8093d0 100644
--- a/compiler/dex/pass_driver_me_opts.h
+++ b/compiler/dex/pass_driver_me_opts.h
@@ -29,9 +29,9 @@
 
 class PassDriverMEOpts : public PassDriverME {
  public:
-  explicit PassDriverMEOpts(const PassManager* const manager,
-                            const PassManager* const post_opt_pass_manager,
-                            CompilationUnit* cu)
+  PassDriverMEOpts(const PassManager* const manager,
+                   const PassManager* const post_opt_pass_manager,
+                   CompilationUnit* cu)
       : PassDriverME(manager, cu), post_opt_pass_manager_(post_opt_pass_manager) {
   }