import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1169044 - Patch 1 - Refactor setting referrer and referrer policy between fetch and XHR. r=khuey (3912ebaef)
- Bug 1150771 - Let ArrayBuffer through object Xrays. r=gabor (bed760277)
- Bug 1151385 - Fail early for cross-origin sandboxPrototype. r=gabor (3b65b1561)
- Bug 1131707 - Transparently forward the construct bit for function forwarders. r=gabor (1f5792775)
- Bug 1170311 - Stop asserting non-null argument to nsIPrincipal::{subsumes,equals}{,ConsideringDomain}. r=gabor (7e36d6683)
- Bug 1171175 - Improve BasePrincipal::IsCodebasePrincipal. r=baku (0d278e8f4)
- Bug 1174731 - patch 1 - Make searchParams attribute readonly, r=smaug (11f5d6dcf)
- Bug 1174731 - patch 2 - Make searchParams attribute readonly, r=annevk (4aa7ea1e4)
- Bug 1170097 - Part 1: Move OriginAttributeDictionary. r=bholley (63a1139dd)
- Bug 1084525 - Part 1: Create initial PromisesActor skeleton r=fitzgen (2ef0ad37d)
- Bug 1131643 - Implement a Location object;r=jlong (710fb9b79)
- Bug 1129834 - Store BreakpointActors by original location;r=jlong (67d16d37a)
- Bug 1129837 - Remove generatedLocation from BreakpointActor;r=jlongster (018a60746)
- Bug 1082837 - test cases for image redirects loaded from the imagelib cache. r=smaug, ckerschb (49d216725)
- Bug 1073352, part 2 - Enable some devtools tests. r=ejpbruel (0de7cfdc0)
- Bug 1131646 - Clean up the breakpoint code;r=jlongster (7fa9c6a76)
- Bug 1136146 - Merge the latest version of the source-map library with fx-team;r=fitzgen (983f2c2e9)
- Bug 1042976 follow up - Remove getInnerId from script actors; r=Mossop (43f935298)
- Bug 837630 - Stop hiding __proto__ from O.getOwnPropertyNames. r=Waldo,peterv,past (0f321614d)
- Bug 1138975 - Refactor breakpoint sliding for non-source mapped sources;r=jlong (9fd4be4e4)
- Fix breaking on the "load" event in the debugger (bug 1054159). r=ochameau (6b6b40e78)
- Bug 983469 - Pause on breakpoint condition exception. r=fitzgen (fb6dfab57)
- Bug 1135435 - Add UI for breakpoint condition throws. r=fitzgen (b2f49cb03)
- Bug 1137384 - Rename ThreadSources as TabSources and move it up into the TabActor. r=ejpbruel (fdf1db5d9)

dom/base/URL.cpp

@@ -27,7 +27,6 @@ NS_IMPL_CYCLE_COLLECTION_CLASS(URL)
 
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(URL)
   if (tmp->mSearchParams) {
-    tmp->mSearchParams->RemoveObserver(tmp);
     NS_IMPL_CYCLE_COLLECTION_UNLINK(mSearchParams)
   }
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
@@ -358,7 +357,7 @@ URL::UpdateURLSearchParams()
     }
   }
 
-  mSearchParams->ParseInput(search, this);
+  mSearchParams->ParseInput(search);
 }
 
 void
@@ -484,22 +483,6 @@ URL::SearchParams()
   return mSearchParams;
 }
 
-void
-URL::SetSearchParams(URLSearchParams& aSearchParams)
-{
-  if (mSearchParams) {
-    mSearchParams->RemoveObserver(this);
-  }
-
-  // the observer will be cleared using the cycle collector.
-  mSearchParams = &aSearchParams;
-  mSearchParams->AddObserver(this);
-
-  nsAutoString search;
-  mSearchParams->Serialize(search);
-  SetSearchInternal(search);
-}
-
 void
 URL::GetHash(nsAString& aHash, ErrorResult& aRv) const
 {
@@ -534,8 +517,7 @@ void
 URL::CreateSearchParamsIfNeeded()
 {
   if (!mSearchParams) {
-    mSearchParams = new URLSearchParams();
-    mSearchParams->AddObserver(this);
+    mSearchParams = new URLSearchParams(this);
     UpdateURLSearchParams();
   }
 }