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

- Bug 1072150 - Don't examine the subject principal in CheckSameOrigin. r=bz (60cbce0bd4)
- Bug 633154. When alerts/prompts/confirms are suppressed, just return silently instead of throwing. r=sicking (a9b5bffb50)
- Bug 1199295 - Pass right loadingPrincipal to uriloader/prefetch - dom changes (r=smaug) (c83e28c82f)
- Bug 1206559, forward PuppetWidget::SetFocus request to the parent process, r=smaug (545b4befd2)
- Bug 1171234 - Include triggering node in load info when doing prefetching (r=ckerschb) (28626724ea)
- Bug 1192948 - Use channel->ascynOpen2 in uriloader/prefetch (r=smaug) (24cde65def)
- Bug 1199295 - Pass right loadingPrincipal to uriloader/prefetch (r=mayhemer) (0a70254f49)
- Bug 1111581 - Fix prefetch for e10s. r=mayhemer (1743b37e85)
- adapted Bug 1172396 - Check for GMP resources from chrome process instead of content (71d438785f)
- Bug 1184276 - Add some logging and don't bail if we can't find an nsPluginTag in RecvGetBlocklistState to try and get more diagnostic info r=billm (963ec63ad3)
- Bug 1194897 - Copy parent window chromeFlags when instantiating a new TabParent in the parent process. r=smaug (296cafaacc)
- Bug 1181467 - Fix mime type checking while copying image. r=Enn (2c77c687e5)
- Bug 1139860 - Fix xpcshell content process timeout crashes (r=jimm) (e594a31bff)
- Bug 1207490 - Part 1: Remove use of expression closure from browser/base/. r=dao (ef5ba24cbe)
- Bug 1059014 (part 1) - Remove support for max line box width. r=dbaron. (eaf2e94721)

layout/base/nsPresShell.cpp

@@ -790,8 +790,6 @@ PresShell::PresShell()
 
   mScrollPositionClampingScrollPortSizeSet = false;
 
-  mMaxLineBoxWidth = 0;
-
   static bool addedSynthMouseMove = false;
   if (!addedSynthMouseMove) {
     Preferences::AddBoolVarCache(&sSynthMouseMove,
@@ -10927,19 +10925,6 @@ nsIPresShell::FontSizeInflationEnabled()
   return mFontSizeInflationEnabled;
 }
 
-void
-nsIPresShell::SetMaxLineBoxWidth(nscoord aMaxLineBoxWidth)
-{
-  NS_ASSERTION(aMaxLineBoxWidth >= 0, "attempting to set max line box width to a negative value");
-
-  if (mMaxLineBoxWidth != aMaxLineBoxWidth) {
-    mMaxLineBoxWidth = aMaxLineBoxWidth;
-    mReflowOnZoomPending = true;
-    FrameNeedsReflow(GetRootFrame(), nsIPresShell::eResize,
-                     NS_FRAME_HAS_DIRTY_CHILDREN);
-  }
-}
-
 void
 PresShell::PausePainting()
 {