make chrome.tabs.executeScript/insertCss details arg required

chrome/common/extensions/api/extension_api.json

Index: chrome/common/extensions/api/extension_api.json
diff --git a/chrome/common/extensions/api/extension_api.json b/chrome/common/extensions/api/extension_api.json
index ab9de52638710cb3fad584e2a27eee760c48c2f8..58570ccc7e0c8054b09386203813884f1c95eccd 100755
--- a/chrome/common/extensions/api/extension_api.json
+++ b/chrome/common/extensions/api/extension_api.json
@@ -724,8 +724,7 @@
               "code": {"type": "string", "optional": true, "description": "JavaScript code to execute."},
               "file": {"type": "string", "optional": true, "description": "JavaScript file to execute."},
               "allFrames": {"type": "boolean", "optional": true, "description": "If allFrames is true, this function injects script into all frames of current page. By default, it's false and only inject script into top main frame."}
-            },
-            "optional": true
+            }
           },
           {
             "type": "function",
@@ -750,8 +749,7 @@
               "code": {"type": "string", "optional": true, "description": "CSS code to be injected."},
               "file": {"type": "string", "optional": true, "description": "CSS file to be injected."},
               "allFrames": {"type": "boolean", "optional": true, "description": "If allFrames is true, this function injects css text into all frames of current page. By default, it's false and only inject css text into top main frame."}
-            },
-            "optional": true
+            }
           },
           {
             "type": "function",