Optimizing compiler: remove unnecessary `explicit' keywords.

Change-Id: I5927fd92d53308c81e14edbd6e7d1c943bfa085b
diff --git a/compiler/optimizing/code_generator_x86.cc b/compiler/optimizing/code_generator_x86.cc
index 0db4311..2fcbc49 100644
--- a/compiler/optimizing/code_generator_x86.cc
+++ b/compiler/optimizing/code_generator_x86.cc
@@ -92,9 +92,9 @@
 
 class BoundsCheckSlowPathX86 : public SlowPathCode {
  public:
-  explicit BoundsCheckSlowPathX86(HBoundsCheck* instruction,
-                                  Location index_location,
-                                  Location length_location)
+  BoundsCheckSlowPathX86(HBoundsCheck* instruction,
+                         Location index_location,
+                         Location length_location)
       : instruction_(instruction), index_location_(index_location), length_location_(length_location) {}
 
   virtual void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {