Bug 1533870: Preemptively fix unified build bustage in layout/style. r=boris

I wrote this patch by first removing UNIFIED_ from layout/style/moz.build, and
then rebuilding, and then addressing build errors one by one.

Nearly all of the build errors were for using the "Document" type without a
proper namespace, and I've addressed this by sprinkling "using namespace"
declarations in the affected .cpp files (and removing a few now-unnecessary
dom:: prefixes on types in those files).

The only other errors were for WorkletGlobalScope.h which needed an #include to
provide the type "DOMHighResTimeStamp", and nsHTMLStyleSheet.h which needed a
forward-declaration for the type "mozilla::dom::Document".

Differential Revision: https://phabricator.services.mozilla.com/D22767

--HG--
extra : moz-landing-system : lando

dom/worklet/WorkletGlobalScope.h

@@ -11,6 +11,7 @@
 #include "mozilla/ErrorResult.h"
 #include "mozilla/TimeStamp.h"
 #include "mozilla/dom/BindingDeclarations.h"
+#include "nsDOMNavigationTiming.h"
 #include "nsIGlobalObject.h"
 #include "nsWrapperCache.h"
 

layout/style/ImageLoader.cpp

@@ -22,6 +22,8 @@
 #include "GeckoProfiler.h"
 #include "mozilla/layers/WebRenderUserData.h"
 
+using namespace mozilla::dom;
+
 namespace mozilla {
 namespace css {
 

layout/style/ServoCSSParser.cpp

@@ -13,6 +13,7 @@
 #include "mozilla/dom/Document.h"
 
 using namespace mozilla;
+using namespace mozilla::dom;
 
 /* static */
 bool ServoCSSParser::IsValidCSSColor(const nsAString& aValue) {

layout/style/StyleAnimationValue.cpp

@@ -33,6 +33,7 @@
 
 using namespace mozilla;
 using namespace mozilla::css;
+using namespace mozilla::dom;
 using namespace mozilla::gfx;
 using nsStyleTransformMatrix::Decompose2DMatrix;
 using nsStyleTransformMatrix::Decompose3DMatrix;

layout/style/nsDOMCSSAttrDeclaration.cpp

@@ -22,9 +22,10 @@
 #include "ActiveLayerTracker.h"
 
 using namespace mozilla;
+using namespace mozilla::dom;
 
-nsDOMCSSAttributeDeclaration::nsDOMCSSAttributeDeclaration(
-    dom::Element* aElement, bool aIsSMILOverride)
+nsDOMCSSAttributeDeclaration::nsDOMCSSAttributeDeclaration(Element* aElement,
+                                                           bool aIsSMILOverride)
     : mElement(aElement), mIsSMILOverride(aIsSMILOverride) {
   NS_ASSERTION(aElement, "Inline style for a NULL element?");
 }

layout/style/nsDOMCSSDeclaration.cpp

@@ -22,13 +22,14 @@
 #include "mozilla/layers/ScrollLinkedEffectDetector.h"
 
 using namespace mozilla;
+using namespace mozilla::dom;
 
 nsDOMCSSDeclaration::~nsDOMCSSDeclaration() = default;
 
 /* virtual */
 JSObject* nsDOMCSSDeclaration::WrapObject(JSContext* aCx,
                                           JS::Handle<JSObject*> aGivenProto) {
-  return dom::CSS2Properties_Binding::Wrap(aCx, this, aGivenProto);
+  return CSS2Properties_Binding::Wrap(aCx, this, aGivenProto);
 }
 
 NS_IMPL_QUERY_INTERFACE(nsDOMCSSDeclaration, nsICSSDeclaration)

layout/style/nsHTMLStyleSheet.h

@@ -22,6 +22,11 @@
 
 class nsMappedAttributes;
 struct RawServoDeclarationBlock;
+namespace mozilla {
+namespace dom {
+class Document;
+}  // namespace dom
+}  // namespace mozilla
 
 class nsHTMLStyleSheet final {
  public: