Nix Windows-specific textfield move-by-word behavior; enable tests.

ui/gfx/render_text_harfbuzz.cc

Index: ui/gfx/render_text_harfbuzz.cc
diff --git a/ui/gfx/render_text_harfbuzz.cc b/ui/gfx/render_text_harfbuzz.cc
index 32a9e554f60b47127cef9d426aef71a9f410adfa..e83b0a1f0b5d94e810603eb1f5424ac6719ff268 100644
--- a/ui/gfx/render_text_harfbuzz.cc
+++ b/ui/gfx/render_text_harfbuzz.cc
@@ -842,41 +842,6 @@ SelectionModel RenderTextHarfBuzz::AdjacentWordSelectionModel(
   if (!success)
     return selection;
 
-  // Match OS specific word break behavior.
-#if defined(OS_WIN)
-  size_t pos;
-  if (direction == CURSOR_RIGHT) {
-    pos = std::min(selection.caret_pos() + 1, text().length());
-    while (iter.Advance()) {
-      pos = iter.pos();
-      if (iter.IsWord() && pos > selection.caret_pos())
-        break;
-    }
-  } else {  // direction == CURSOR_LEFT
-    // Notes: We always iterate words from the beginning.
-    // This is probably fast enough for our usage, but we may
-    // want to modify WordIterator so that it can start from the
-    // middle of string and advance backwards.
-    pos = std::max<int>(selection.caret_pos() - 1, 0);
-    while (iter.Advance()) {
-      if (iter.IsWord()) {
-        size_t begin = iter.pos() - iter.GetString().length();
-        if (begin == selection.caret_pos()) {
-          // The cursor is at the beginning of a word.
-          // Move to previous word.
-          break;
-        } else if (iter.pos() >= selection.caret_pos()) {
-          // The cursor is in the middle or at the end of a word.
-          // Move to the top of current word.
-          pos = begin;
-          break;
-        }
-        pos = iter.pos() - iter.GetString().length();
-      }
-    }
-  }
-  return SelectionModel(pos, CURSOR_FORWARD);
-#else
   internal::TextRunList* run_list = GetRunList();
   SelectionModel cur(selection);
   for (;;) {
@@ -891,7 +856,6 @@ SelectionModel RenderTextHarfBuzz::AdjacentWordSelectionModel(
       break;
   }
   return cur;
-#endif
 }
 
 std::vector<Rect> RenderTextHarfBuzz::GetSubstringBounds(const Range& range) {