Revert 258122 "gpu: Allow fences to check whether a flush has oc..."

trunk/src/ui/gl/gl_fence.h

Index: trunk/src/ui/gl/gl_fence.h
===================================================================
--- trunk/src/ui/gl/gl_fence.h	(revision 258964)
+++ trunk/src/ui/gl/gl_fence.h	(working copy)
@@ -16,16 +16,11 @@
   virtual ~GLFence();
 
   static GLFence* Create();
-
   // Creates a fence that is not guaranteed to signal until the current context
-  // is flushed. It is illegal to call Client/ServerWait() on a fence without
-  // having explicitly called glFlush() or glFinish() in the originating
-  // context.
+  // is flushed. Use with caution.
   static GLFence* CreateWithoutFlush();
-
   virtual bool HasCompleted() = 0;
   virtual void ClientWait() = 0;
-
   // Will block the server if supported, but might fall back to blocking the
   // client.
   virtual void ServerWait() = 0;