Fix the dynamic browser action setIcon path to work with any size icon.

chrome/common/extensions/api/browser_action.json

Index: chrome/common/extensions/api/browser_action.json
diff --git a/chrome/common/extensions/api/browser_action.json b/chrome/common/extensions/api/browser_action.json
index d7ff7438db65c837a8fc27d44dfc6c952cfe23c0..8b7898c68f27a706320f95419b3b29dc410edc98 100644
--- a/chrome/common/extensions/api/browser_action.json
+++ b/chrome/common/extensions/api/browser_action.json
@@ -91,28 +91,22 @@
                   { "$ref": "ImageDataType" },
                   {
                     "type": "object",
-                    "properties": {
-                      "19": {"$ref": "ImageDataType", "optional": true},
-                      "38": {"$ref": "ImageDataType", "optional": true}
-                     }
+                    "additionalProperties": { "type": "any" }
                   }
                 ],
                 "optional": true,
-                "description": "Either an ImageData object or a dictionary {size -> ImageData} representing icon to be set. If the icon is specified as a dictionary, the actual image to be used is chosen depending on screen's pixel density. If the number of image pixels that fit into one screen space unit equals <code>scale</code>, then image with size <code>scale</code> * 19 will be selected. Initially only scales 1 and 2 will be supported. At least one image must be specified. Note that 'details.imageData = foo' is equivalent to 'details.imageData = {'19': foo}'"
+                "description": "Either an ImageData object or a dictionary {size -> ImageData} representing icon to be set. If the icon is specified as a dictionary, the actual image to be used is chosen depending on screen's pixel density. If the number of image pixels that fit into one screen space unit equals <code>scale</code>, then image with size <code>scale</code> * n will be selected, where n is the size of the icon in the UI. At least one image must be specified. Note that 'details.imageData = foo' is equivalent to 'details.imageData = {'16': foo}'"
               },
               "path": {
                 "choices": [
                   { "type": "string" },
                   {
                     "type": "object",
-                    "properties": {
-                      "19": {"type": "string", "optional": true},
-                      "38": {"type": "string", "optional": true}
-                    }
+                    "additionalProperties": { "type": "any" }
                   }
                 ],
                 "optional": true,
-                "description": "Either a relative image path or a dictionary {size -> relative image path} pointing to icon to be set. If the icon is specified as a dictionary, the actual image to be used is chosen depending on screen's pixel density. If the number of image pixels that fit into one screen space unit equals <code>scale</code>, then image with size <code>scale</code> * 19 will be selected. Initially only scales 1 and 2 will be supported. At least one image must be specified. Note that 'details.path = foo' is equivalent to 'details.imageData = {'19': foo}'"
+                "description": "Either a relative image path or a dictionary {size -> relative image path} pointing to icon to be set. If the icon is specified as a dictionary, the actual image to be used is chosen depending on screen's pixel density. If the number of image pixels that fit into one screen space unit equals <code>scale</code>, then image with size <code>scale</code> * n will be selected, where n is the size of the icon in the UI. At least one image must be specified. Note that 'details.path = foo' is equivalent to 'details.path = {'16': foo}'"
               },
               "tabId": {
                 "type": "integer",