Revert of Extracting placeholder information from Webkit to Blimp

blimp/engine/session/blimp_engine_session.cc

Index: blimp/engine/session/blimp_engine_session.cc
diff --git a/blimp/engine/session/blimp_engine_session.cc b/blimp/engine/session/blimp_engine_session.cc
index f71ae27f15c1570a9c0dce82f533d7f202203d95..aee2e39dcccd3944fc1ecd4a08eeeeb323cbdcfe 100644
--- a/blimp/engine/session/blimp_engine_session.cc
+++ b/blimp/engine/session/blimp_engine_session.cc
@@ -421,11 +421,14 @@
   ui::TextInputType type =
       client ? client->GetTextInputType() : ui::TEXT_INPUT_TYPE_NONE;
 
+  // TODO(shaktisahu): Propagate the new type to the client.
   // Hide IME, when text input is out of focus, i.e. if the text input type
   // changes to ui::TEXT_INPUT_TYPE_NONE. For other text input types,
   // OnShowImeIfNeeded is used instead to send show IME request to client.
   if (type == ui::TEXT_INPUT_TYPE_NONE)
-    tab_->HideTextInputUI();
+    render_widget_feature_.SendHideImeRequest(
+        tab_->tab_id(),
+        tab_->web_contents()->GetRenderWidgetHostView()->GetRenderWidgetHost());
 }
 
 void BlimpEngineSession::OnInputMethodDestroyed(
@@ -438,7 +441,10 @@
       !window_tree_host_->GetInputMethod()->GetTextInputClient())
     return;
 
-  tab_->ShowTextInputUI();
+  render_widget_feature_.SendShowImeRequest(
+      tab_->tab_id(),
+      tab_->web_contents()->GetRenderWidgetHostView()->GetRenderWidgetHost(),
+      window_tree_host_->GetInputMethod()->GetTextInputClient());
 }
 
 void BlimpEngineSession::ProcessMessage(