Remove unnecessary 'explicit' attribute.

R=marja@chromium.org

Review URL: https://codereview.chromium.org/206183002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20104 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

include/v8.h

@@ -4121,8 +4121,7 @@ class V8_EXPORT Isolate {
    public:
     enum OnFailure { CRASH_ON_FAILURE, THROW_ON_FAILURE };
 
-    explicit DisallowJavascriptExecutionScope(Isolate* isolate,
-                                              OnFailure on_failure);
+    DisallowJavascriptExecutionScope(Isolate* isolate, OnFailure on_failure);
     ~DisallowJavascriptExecutionScope();
 
    private: