Move Declarative Web Request API out of experimental and make it a feature

chrome/common/extensions/api/declarativeWebRequest.json

Index: chrome/common/extensions/api/declarativeWebRequest.json
diff --git a/chrome/common/extensions/api/experimental.webRequest.json b/chrome/common/extensions/api/declarativeWebRequest.json
similarity index 81%
rename from chrome/common/extensions/api/experimental.webRequest.json
rename to chrome/common/extensions/api/declarativeWebRequest.json
index 1b30d1385472947e59014dc311399b01949f34b8..0a40532a105a21b836b023f0bcc8f94e6e5d1fa0 100644
--- a/chrome/common/extensions/api/experimental.webRequest.json
+++ b/chrome/common/extensions/api/declarativeWebRequest.json
@@ -4,7 +4,8 @@
 
 [
   {
-    "namespace": "experimental.webRequest",
+    "namespace": "declarativeWebRequest",
+    "documentation_permissions_required": ["declarative", "declarativeWebRequest"],
     "types": [
       {
         "id": "RequestMatcher",
@@ -22,7 +23,7 @@
             "description": "Matches if the request type of a request is contained in the list. Requests that cannot match any of the types will be filtered out.",
             "items": { "type": "string", "enum": ["main_frame", "sub_frame", "stylesheet", "script", "image", "object", "xmlhttprequest", "other"] }
           },
-          "instanceType": { "type": "string", "enum": ["experimental.webRequest.RequestMatcher"] }
+          "instanceType": { "type": "string", "enum": ["declarativeWebRequest.RequestMatcher"] }
         }
       },
       {
@@ -30,7 +31,7 @@
         "description": "Declarative event action that cancels a network request.",
         "type": "object",
         "properties": {
-          "instanceType": { "type": "string", "enum": ["experimental.webRequest.CancelRequest"] }
+          "instanceType": { "type": "string", "enum": ["declarativeWebRequest.CancelRequest"] }
         }
       },
       {
@@ -38,7 +39,7 @@
         "description": "Declarative event action that redirects a network request. (TODO: add destination)",
         "type": "object",
         "properties": {
-          "instanceType": { "type": "string", "enum": ["experimental.webRequest.RedirectRequest"] },
+          "instanceType": { "type": "string", "enum": ["declarativeWebRequest.RedirectRequest"] },
           "redirectUrl": { "type": "string", "description": "Destination to where the request is redirected."}
         }
       }