Revert of RenderTextHarfBuzz: Decide run direction by BiDi embedding level

ui/gfx/render_text_harfbuzz.h

Index: ui/gfx/render_text_harfbuzz.h
diff --git a/ui/gfx/render_text_harfbuzz.h b/ui/gfx/render_text_harfbuzz.h
index db59a024cffb289fe0fad60fc9775b876cda0ce1..4e27af9d882cc173f2ddf0700cbfd2a3b7deab36 100644
--- a/ui/gfx/render_text_harfbuzz.h
+++ b/ui/gfx/render_text_harfbuzz.h
@@ -61,7 +61,7 @@
 
 }  // namespace internal
 
-class GFX_EXPORT RenderTextHarfBuzz : public RenderText {
+class RenderTextHarfBuzz : public RenderText {
  public:
   RenderTextHarfBuzz();
   virtual ~RenderTextHarfBuzz();
@@ -90,9 +90,6 @@
   virtual void DrawVisualText(Canvas* canvas) OVERRIDE;
 
  private:
-  friend class RenderTextTest;
-  FRIEND_TEST_ALL_PREFIXES(RenderTextTest, HarfBuzz_RunDirection);
-
   // Return the run index that contains the argument; or the length of the
   // |runs_| vector if argument exceeds the text length or width.
   size_t GetRunContainingCaret(const SelectionModel& caret) const;