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

- Bug 1229623 - Remove compilation/database.py from mach_bootstrap.py. r=mshal (16de324bd5)
- Bug 1228208 - Make sure ICU flags are prepended before system flags. r=glandium (77a099bb4a)
- Bug 1176968 part 2: Add "requirement flags" field to media query features, and logic for ignoring the feature if requirements aren't met. r=heycam (f2fb438cc7)
- Bug 1176968 part 3: Add support for "-webkit-device-pixel-ratio" media query, along with its min/max variants (behind a pref). r=heycam (d9cf15f3f3)
- Bug 1176968 part 4: Add tests for -webkit-device-pixel-ratio, based on existing -moz tests. r=heycam (7a143f1310)
- Bug 1230863 - Remove unused nsPresContext args from many functions. r=roc. (8f3ca74bb8)
- Add APZ support for mousewheel.acceleration prefs. (bug 1214170 part 1, r=kats) (f9ead80db9)
- Add APZ support for mousewheel delta multiplier prefs. (bug 1214170 part 2, r=kats) (111d111124)
- Bug 1143618 - Follow-up to fix static analysis build bustage. r=me on a CLOSED TREE (57c395593f)
- Bug 1021845 - Before compositing, clip the visible region of a layer to the layer's clip rect. r=mattwoodrow (493ad91934)
- Bug 1152046 - move ClosingService::Start/Shutdown to nsIOService. r=mayhemer (4d078b7611)
- Bug 1226909 part 1: Do security checks in a redirect handler rather than when opening the redirected channel. r=ckerschb (30d23ad2ee)
- Bug 1226909 part 2: Let CORS preflight logic grab information from nsILoadInfo rather than duplicate it. r=ckerschb (04ece9d251)
- Bug 1214361 Test final response types after redirect. r=sicking a=abillings (3f288cae02)
- Bug 1210302 - Part 4: Add automated tests; r=sicking (b43a9a02c4)
- Bug 1226909 part 3: Move logic of when to initiate CORS preflight into channels. Allow CORS preflight to happen when doing a same-origin to cross-origin redirect. r=ckerschb (816498fdb5)
- Bug 1216793 - check against tracking protection list in fetch(). r=gcp (1ddeb07832)
- Bug 1228342 - initialize mTainting by all constructors. r=bkelly (60e63d22bd)
- Bug 1226909 part 4: Make AsyncOpen2 set taining information on channels. Use this information in XHR and fetch(). r=bkelly (3b0bc77efc)
- Bug 1214819. Add support for @crossorigin to <link rel=prefetch> so resources can be prefetched via anonymous CORS, for example. r=hurley (de8b0aef94)
- Bug 1216687: Add nsILoadInfo flags for cookie policies. r=ckerschb (f2634fd5b0)
- Bug 1213443 - Parallelism for <link rel=prefetch> r=bz (f5ee458126)

layout/mathml/nsMathMLmtableFrame.cpp

@@ -781,8 +781,7 @@ nsMathMLmtableOuterFrame::AttributeChanged(int32_t  aNameSpaceID,
 }
 
 nsIFrame*
-nsMathMLmtableOuterFrame::GetRowFrameAt(nsPresContext* aPresContext,
-                                        int32_t         aRowIndex)
+nsMathMLmtableOuterFrame::GetRowFrameAt(int32_t aRowIndex)
 {
   int32_t rowCount = GetRowCount();
 
@@ -846,7 +845,7 @@ nsMathMLmtableOuterFrame::Reflow(nsPresContext*          aPresContext,
   nscoord blockSize = aDesiredSize.BSize(wm);
   nsIFrame* rowFrame = nullptr;
   if (rowIndex) {
-    rowFrame = GetRowFrameAt(aPresContext, rowIndex);
+    rowFrame = GetRowFrameAt(rowIndex);
     if (rowFrame) {
       // translate the coordinates to be relative to us and in our writing mode
       nsIFrame* frame = rowFrame;