Remove Chromium plumbing for fixed-position-creates-stacking-context.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index b85c967bca9e9651f58d1a48f6b9be982e752afb..1db5bbb4dd300d201b95d6f36b203cde3e564720 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -152,9 +152,6 @@ const char kDisableFileSystem[]             = "disable-file-system";
 // Disables sending filters (SkImageFilter objects) between processes over IPC
 const char kDisableFiltersOverIPC[]         = "disable-filters-over-ipc";
 
-const char kDisableFixedPositionCreatesStackingContext[]
-    = "disable-fixed-position-creates-stacking-context";
-
 // Disable 3D inside of flapper.
 const char kDisableFlash3d[]                = "disable-flash-3d";
 
@@ -399,9 +396,6 @@ const char kEnableFileCookies[]             = "enable-file-cookies";
 // Enable the fast text autosizing implementation.
 const char kEnableFastTextAutosizing[]      = "enable-fast-text-autosizing";
 
-const char kEnableFixedPositionCreatesStackingContext[]
-    = "enable-fixed-position-creates-stacking-context";
-
 // Enable Gesture Tap Highlight
 const char kEnableGestureTapHighlight[]     = "enable-gesture-tap-highlight";