Add missing (and remove superfluous) 'explicit' from constructors.

webkit/glue/weburlrequest_extradata_impl.h

Index: webkit/glue/weburlrequest_extradata_impl.h
diff --git a/webkit/glue/weburlrequest_extradata_impl.h b/webkit/glue/weburlrequest_extradata_impl.h
index d4b2c194b6c14d3448ddbb79cb69f82ffcf43324..ad8652052f0b04c5eeef1642bd008208b092ae91 100644
--- a/webkit/glue/weburlrequest_extradata_impl.h
+++ b/webkit/glue/weburlrequest_extradata_impl.h
@@ -23,9 +23,8 @@ class WEBKIT_GLUE_EXPORT WebURLRequestExtraDataImpl :
   // override and an empty string to indicate that there should be no user
   // agent. This needs to be here, instead of content's |RequestExtraData| since
   // ppb_url_request_info_impl.cc needs to be able to set it.
-  explicit WebURLRequestExtraDataImpl(
-      WebKit::WebReferrerPolicy referrer_policy,
-      const WebKit::WebString& custom_user_agent);
+  WebURLRequestExtraDataImpl(WebKit::WebReferrerPolicy referrer_policy,
+                             const WebKit::WebString& custom_user_agent);
   virtual ~WebURLRequestExtraDataImpl();
 
   WebKit::WebReferrerPolicy referrer_policy() const { return referrer_policy_; }