Fix remaining cases of webbrowser-related XUI warnings

indra/newview/llfloatersearch.cpp

@@ -161,15 +161,14 @@ void LLFloaterSearch::initiateSearch(const LLSD& tokens)
 
     // Naviation to the calculated URL - we know it's HTML so we can
     // tell the media system not to bother with the MIME type check.
-    LLMediaCtrl* search_browser = findChild<LLMediaCtrl>("search_contents");
-    search_browser->navigateTo(url, HTTP_CONTENT_TEXT_HTML);
+    mWebBrowser->navigateTo(url, HTTP_CONTENT_TEXT_HTML);
 }
 
 bool LLFloaterSearch::postBuild()
 {
-    LLFloaterWebContent::postBuild();
-    mWebBrowser = getChild<LLMediaCtrl>("search_contents");
-    mWebBrowser->addObserver(this);
+    if (!LLFloaterWebContent::postBuild())
+        return false;
+
     mWebBrowser->setErrorPageURL(gSavedSettings.getString("GenericErrorPageURL"));
 
     // If cookie is there, will set it now, Otherwise will have to wait for login completion

indra/newview/llviewermedia.cpp

@@ -1364,7 +1364,7 @@ void LLViewerMedia::getOpenIDCookieCoro(std::string url)
                         std::string browser_name;
                     };
                     struct MediaCookieInstance media_cookie_instances[] = {
-                        {"search", "search_contents" },
+                        {"search", "webbrowser" },
                         {"marketplace", "webbrowser" },
                         {"destinations", "destination_guide_contents" },
                     };

indra/newview/skins/default/xui/en/floater_search.xml

@@ -170,7 +170,7 @@
         layout="topleft"
         left="0"
         trusted_content="true"
-        name="search_contents"
+        name="webbrowser"
         top="0"/>
     </layout_panel>
     <layout_panel name="status_bar"