Revert of Extracting placeholder information from Webkit to Blimp

blimp/engine/feature/engine_render_widget_feature.h

Index: blimp/engine/feature/engine_render_widget_feature.h
diff --git a/blimp/engine/feature/engine_render_widget_feature.h b/blimp/engine/feature/engine_render_widget_feature.h
index 4b0fbd1957ee98e6071171d1c1420344e71e5519..b756b2c33093ec145cd88f55a1859a594327761c 100644
--- a/blimp/engine/feature/engine_render_widget_feature.h
+++ b/blimp/engine/feature/engine_render_widget_feature.h
@@ -25,7 +25,6 @@
 
 namespace content {
 class RenderWidgetHost;
-struct FormFieldData;
 }
 
 namespace blimp {
@@ -94,7 +93,7 @@
   // Notifies the client to show/hide IME.
   void SendShowImeRequest(const int tab_id,
                           content::RenderWidgetHost* render_widget_host,
-                          const content::FormFieldData& field);
+                          const ui::TextInputClient* client);
   void SendHideImeRequest(const int tab_id,
                           content::RenderWidgetHost* render_widget_host);