diff --git a/content/events/src/nsEventStateManager.cpp b/content/events/src/nsEventStateManager.cpp
index 4f9de19b0f3..90cf4d7abb2 100644
--- a/content/events/src/nsEventStateManager.cpp
+++ b/content/events/src/nsEventStateManager.cpp
@@ -2515,8 +2515,7 @@ GetParentFrameToScroll(nsPresContext* aPresContext, nsIFrame* aFrame)
if (!aPresContext || !aFrame)
return nsnull;
- if (aFrame->GetStyleDisplay()->mPosition == NS_STYLE_POSITION_FIXED &&
- nsLayoutUtils::IsReallyFixedPos(aFrame))
+ if (aFrame->GetStyleDisplay()->mPosition == NS_STYLE_POSITION_FIXED)
return aPresContext->GetPresShell()->GetRootScrollFrame();
return aFrame->GetParent();
diff --git a/layout/base/crashtests/455171-4.html b/layout/base/crashtests/455171-4.html
deleted file mode 100644
index f85b91278a0..00000000000
--- a/layout/base/crashtests/455171-4.html
+++ /dev/null
@@ -1,8 +0,0 @@
-
-Testcase, bug 455171
-
-
diff --git a/layout/base/crashtests/crashtests.list b/layout/base/crashtests/crashtests.list
index 6e434124701..a8a4e39a40c 100644
--- a/layout/base/crashtests/crashtests.list
+++ b/layout/base/crashtests/crashtests.list
@@ -128,4 +128,3 @@ load 444925-1.xul
load 455063-1.html
load 455063-2.html
load 455063-3.html
-load 455171-4.html
diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index 1b1d47d783e..9c0e751361b 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -1782,11 +1782,7 @@ GetChildListNameFor(nsIFrame* aChildFrame)
if (NS_STYLE_POSITION_ABSOLUTE == disp->mPosition) {
listName = nsGkAtoms::absoluteList;
} else if (NS_STYLE_POSITION_FIXED == disp->mPosition) {
- if (nsLayoutUtils::IsReallyFixedPos(aChildFrame)) {
- listName = nsGkAtoms::fixedList;
- } else {
- listName = nsGkAtoms::absoluteList;
- }
+ listName = nsGkAtoms::fixedList;
#ifdef MOZ_XUL
} else if (NS_STYLE_DISPLAY_POPUP == disp->mDisplay) {
// Out-of-flows that are DISPLAY_POPUP must be kids of the root popup set
diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
index 943a3f98fef..6cd2870d03b 100644
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -3029,18 +3029,6 @@ nsLayoutUtils::GetDeviceContextForScreenInfo(nsIDocShell* aDocShell)
return nsnull;
}
-/* static */ PRBool
-nsLayoutUtils::IsReallyFixedPos(nsIFrame* aFrame)
-{
- NS_PRECONDITION(aFrame->GetParent(),
- "IsReallyFixedPos called on frame not in tree");
- NS_PRECONDITION(aFrame->GetStyleDisplay()->mPosition ==
- NS_STYLE_POSITION_FIXED,
- "IsReallyFixedPos called on non-'position:fixed' frame");
-
- return aFrame->GetParent()->GetType() == nsGkAtoms::viewportFrame;
-}
-
nsSetAttrRunnable::nsSetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName,
const nsAString& aValue)
: mContent(aContent),
diff --git a/layout/base/nsLayoutUtils.h b/layout/base/nsLayoutUtils.h
index a776d6fea4f..c59f62d9a9a 100644
--- a/layout/base/nsLayoutUtils.h
+++ b/layout/base/nsLayoutUtils.h
@@ -918,14 +918,6 @@ public:
static nsIDeviceContext*
GetDeviceContextForScreenInfo(nsIDocShell* aDocShell);
- /**
- * Some frames with 'position: fixed' (nsStylePosition::mDisplay ==
- * NS_STYLE_POSITION_FIXED) are not really fixed positioned, since
- * they're inside an element with -moz-transform. This function says
- * whether such an element is a real fixed-pos element.
- */
- static PRBool IsReallyFixedPos(nsIFrame* aFrame);
-
/**
* Indicates if the nsIFrame::GetUsedXXX assertions in nsFrame.cpp should
* disabled.
diff --git a/layout/generic/crashtests/455171-1.html b/layout/generic/crashtests/455171-1.html
deleted file mode 100644
index 97bc98c7a77..00000000000
--- a/layout/generic/crashtests/455171-1.html
+++ /dev/null
@@ -1,5 +0,0 @@
-
-
-
-
-
diff --git a/layout/generic/crashtests/455171-2.html b/layout/generic/crashtests/455171-2.html
deleted file mode 100644
index a8a11ad4cc7..00000000000
--- a/layout/generic/crashtests/455171-2.html
+++ /dev/null
@@ -1,7 +0,0 @@
-
-
-
-
-
-
-
diff --git a/layout/generic/crashtests/455171-3.html b/layout/generic/crashtests/455171-3.html
deleted file mode 100644
index e463d2b607e..00000000000
--- a/layout/generic/crashtests/455171-3.html
+++ /dev/null
@@ -1,2 +0,0 @@
-