[DevTools] Bring back inspect element mode shortcut regressed in r193545.

Source/devtools/front_end/main/module.json

 {
     "extensions": [
         {
             "type": "@WebInspector.AppProvider",
             "condition": "can_dock",
             "className": "WebInspector.AdvancedAppProvider",
             "order": 0
         },
         {
             "type": "@WebInspector.AppProvider",
@@ skipping 51 matching lines @@
             "className": "WebInspector.Main.ReloadActionDelegate",
             "bindings": [
                 {
                     "shortcut": "Alt+R"
                 }
             ]
         },
         {
             "type": "@WebInspector.ActionDelegate",
             "actionId": "main.toggle-element-search",
-            "contextTypes": ["WebInspector.InspectElementModeController"],
             "className": "WebInspector.InspectElementModeController.ToggleSearchActionDelegate",
             "bindings": [
                 {
                     "platform": "windows,linux",
                     "shortcut": "Ctrl+Shift+C"
                 },
                 {
                     "platform": "mac",
                     "shortcut": "Meta+Shift+C"
                 }
@@ skipping 232 matching lines @@
         "Tests.js",
         "OverlayController.js",
         "Main.js"
     ],
     "skip_compilation": [
         "Tests.js"
     ],
     "resources": [
     ]
 }