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

BUG=522939
TBR=pfeldman

Review URL: https://codereview.chromium.org/1307643002

git-svn-id: svn://svn.chromium.org/blink/trunk@200947 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/devtools/front_end/main/module.json

@@ -69,7 +69,6 @@
         {
             "type": "@WebInspector.ActionDelegate",
             "actionId": "main.toggle-element-search",
-            "contextTypes": ["WebInspector.InspectElementModeController"],
             "className": "WebInspector.InspectElementModeController.ToggleSearchActionDelegate",
             "bindings": [
                 {