Fix most of the downloads api in incognito profiles

chrome/common/extensions/api/experimental.downloads.json

Index: chrome/common/extensions/api/experimental.downloads.json
diff --git a/chrome/common/extensions/api/experimental.downloads.json b/chrome/common/extensions/api/experimental.downloads.json
index 3aeecb230745fa4921230a09151ddad9af99ed6d..6bb443602b60e06615856d09a48cf290dd868b17 100644
--- a/chrome/common/extensions/api/experimental.downloads.json
+++ b/chrome/common/extensions/api/experimental.downloads.json
@@ -142,6 +142,11 @@
             "type": "string",
             "description": "absolute local path"
           },
+          "incognito": {
+            "type": "boolean",
+            "description": "True if this download is off-the-record, false otherwise.",
+            "optional": true
+          },
           "danger": {
             "$ref": "DownloadDangerType",
             "description": "Indication of whether this download is thought to be safe or known to be suspicious.",
@@ -269,6 +274,12 @@
             "optional": true,
             "description": "absolute local path"
           },
+          "incognito": {
+            "type": "string",
+            "optional": true,
+            "enum": ["none", "only"],
+            "description": "Whether to include only off-the-record downloads in the results, or no off-the-record downloads. The default (undefined) is to include both."
+          },
           "danger": {
             "$ref": "DownloadDangerType",
             "description": "Indication of whether this download is thought to be safe or known to be suspicious.",