Revert 135160 - Re-land: Add initial GTK web accessibility framework.

content/browser/accessibility/browser_accessibility.cc

Index: content/browser/accessibility/browser_accessibility.cc
===================================================================
--- content/browser/accessibility/browser_accessibility.cc	(revision 135165)
+++ content/browser/accessibility/browser_accessibility.cc	(working copy)
@@ -15,11 +15,9 @@
 typedef WebAccessibility::IntAttribute IntAttribute;
 typedef WebAccessibility::StringAttribute StringAttribute;
 
-#if !defined(OS_MACOSX) && \
-    !(defined(OS_WIN) && !defined(USE_AURA)) && \
-    !defined(TOOLKIT_GTK)
-// We have subclassess of BrowserAccessibility on Mac, Linux/GTK,
-// and non-Aura Win. For any other platform, instantiate the base class.
+#if (defined(OS_POSIX) && !defined(OS_MACOSX)) || defined(USE_AURA)
+// There's no OS-specific implementation of BrowserAccessibilityManager
+// on Unix, so just instantiate the base class.
 // static
 BrowserAccessibility* BrowserAccessibility::Create() {
   return new BrowserAccessibility();