Optimizing compiler: remove unnecessary `explicit' keywords.

Change-Id: I5927fd92d53308c81e14edbd6e7d1c943bfa085b
diff --git a/compiler/optimizing/code_generator_arm.cc b/compiler/optimizing/code_generator_arm.cc
index 206ed13..d8e9dec 100644
--- a/compiler/optimizing/code_generator_arm.cc
+++ b/compiler/optimizing/code_generator_arm.cc
@@ -118,9 +118,9 @@
 
 class BoundsCheckSlowPathARM : public SlowPathCode {
  public:
-  explicit BoundsCheckSlowPathARM(HBoundsCheck* instruction,
-                                  Location index_location,
-                                  Location length_location)
+  BoundsCheckSlowPathARM(HBoundsCheck* instruction,
+                         Location index_location,
+                         Location length_location)
       : instruction_(instruction),
         index_location_(index_location),
         length_location_(length_location) {}