Bug 1311244 Part 0 - Preemptively fix unified build bustage in nsLayoutUtils.
The is a preemptively fix for unified bustage after Part 2 adds a new file
under layout/base/.
The error was:
In static member function 'static bool nsLayoutUtils::SupportsServoStyleBackend(nsIDocument*)':
invalid static_cast from type 'nsIDocument*' to type 'nsDocument*'
MozReview-Commit-ID: A8xTSPgh8Ls
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -17,16 +17,17 @@
#include "mozilla/gfx/PathHelpers.h"
#include "mozilla/layers/PAPZ.h"
#include "mozilla/Likely.h"
#include "mozilla/Maybe.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/Unused.h"
#include "nsCharTraits.h"
+#include "nsDocument.h"
#include "nsFontMetrics.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMHTMLElement.h"
#include "nsFrameList.h"
#include "nsGkAtoms.h"
#include "nsHtml5Atoms.h"
