Remove unnecessary `explicit` qualifiers on constructors.

Change-Id: Id12e392ad50f66a6e2251a68662b7959315dc567
diff --git a/compiler/jni/quick/mips/calling_convention_mips.h b/compiler/jni/quick/mips/calling_convention_mips.h
index 8d82dce..dc45432 100644
--- a/compiler/jni/quick/mips/calling_convention_mips.h
+++ b/compiler/jni/quick/mips/calling_convention_mips.h
@@ -48,7 +48,7 @@
 
 class MipsJniCallingConvention FINAL : public JniCallingConvention {
  public:
-  explicit MipsJniCallingConvention(bool is_static, bool is_synchronized, const char* shorty);
+  MipsJniCallingConvention(bool is_static, bool is_synchronized, const char* shorty);
   ~MipsJniCallingConvention() OVERRIDE {}
   // Calling convention
   ManagedRegister ReturnRegister() OVERRIDE;