Revert 151996 "Avoid N^2 walk placing renderers when building th..."

Source/core/dom/Text.cpp

Index: Source/core/dom/Text.cpp
diff --git a/Source/core/dom/Text.cpp b/Source/core/dom/Text.cpp
index 5fa58606f386f31fc724d41e2a20ab581fc201a7..7a44150a5bc3193f8a5a1f65d05cb5bdaff0bea0 100644
--- a/Source/core/dom/Text.cpp
+++ b/Source/core/dom/Text.cpp
@@ -216,9 +216,7 @@ bool Text::textRendererIsNeeded(const NodeRenderingContext& context)
     
     if (context.style()->preserveNewline()) // pre/pre-wrap/pre-line always make renderers.
         return true;
-
-    // FIXME: We should resolve this function's dependencies on next and previous renderers
-    // lazily to avoid potentially N^2 walks through the DOM.
+    
     RenderObject* prev = context.previousRenderer();
     if (prev && prev->isBR()) // <span><br/> <br/></span>
         return false;