Implement STYLE_LOWERCASE style for Aura NativeTextfield.

ui/views/controls/textfield/textfield_views_model.h

Index: ui/views/controls/textfield/textfield_views_model.h
diff --git a/ui/views/controls/textfield/textfield_views_model.h b/ui/views/controls/textfield/textfield_views_model.h
index cf6dea7c88ee68854750c2feb362fabbc4ac7949..0e347db2641fce1a24ac3c8e3df8a1ccd12d368f 100644
--- a/ui/views/controls/textfield/textfield_views_model.h
+++ b/ui/views/controls/textfield/textfield_views_model.h
@@ -185,7 +185,7 @@ class VIEWS_EXPORT TextfieldViewsModel {
   bool Copy();
 
   // Pastes text from the clipboard at current cursor position. Returns true
-  // if text has changed after pasting.
+  // if any text is pasted.
   bool Paste();
 
   // Tells if any text is selected, even if the selection is in composition
@@ -208,7 +208,7 @@ class VIEWS_EXPORT TextfieldViewsModel {
   void GetTextRange(ui::Range* range) const;
 
   // Sets composition text and attributes. If there is composition text already,
-  // it’ll be replaced by the new one. Otherwise, current selection will be
+  // it'll be replaced by the new one. Otherwise, current selection will be
   // replaced. If there is no selection, the composition text will be inserted
   // at the insertion point.
   // Any changes to the model except text insertion will confirm the current