DevTools: rename default color theme into "Light"

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

 {
     "extensions": [
         {
             "type": "@Common.AppProvider",
             "className": "Main.SimpleAppProvider",
             "order": 10
         },
         {
             "type": "@UI.ContextMenu.Provider",
             "contextTypes": ["Workspace.UISourceCode", "SDK.Resource", "SDK.NetworkRequest"],
@@ skipping 247 matching lines @@
             ]
         },
         {
             "type": "setting",
             "category": "Appearance",
             "title": "Theme:",
             "settingName": "uiTheme",
             "settingType": "enum",
             "defaultValue": "default",
             "options": [
-                { "title": "Switch to default theme", "text": "Default", "value": "default" },
+                { "title": "Switch to light theme", "text": "Light", "value": "default" },
                 { "title": "Switch to dark theme", "text": "Dark", "value": "dark" }
-            ]
+            ],
+            "tags": "dark, light"
         },
         {
             "type": "setting",
             "category": "Appearance",
             "title": "Panel layout:",
             "settingName": "sidebarPosition",
             "settingType": "enum",
             "defaultValue": "auto",
             "options": [
                 { "title": "Use horizontal panel layout", "text": "horizontal", "value": "bottom" },
@@ skipping 84 matching lines @@
         "OverlayController.js",
         "Main.js"
     ],
     "resources": [
         "errorWarningCounter.css",
         "remoteDebuggingTerminatedScreen.css",
         "renderingOptions.css",
         "targetCrashedScreen.css"
     ]
 }