Fix an IME bug where RWHImpl::ImeFinishCompositingText is called twice in a row

content/browser/renderer_host/render_widget_host_view_event_handler.cc

Index: content/browser/renderer_host/render_widget_host_view_event_handler.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_event_handler.cc b/content/browser/renderer_host/render_widget_host_view_event_handler.cc
index 0401ce699cc82e53ffd698e046c6a9d32fac574a..f0c1e1cbb08940c969609a249cd5d1efebbe7c67 100644
--- a/content/browser/renderer_host/render_widget_host_view_event_handler.cc
+++ b/content/browser/renderer_host/render_widget_host_view_event_handler.cc
@@ -626,12 +626,11 @@ bool RenderWidgetHostViewEventHandler::CanRendererHandleEvent(
 }
 
 void RenderWidgetHostViewEventHandler::FinishImeCompositionSession() {
-  if (!host_view_->GetTextInputClient()->HasCompositionText())
-    return;
-
-  TextInputManager* text_input_manager = host_view_->GetTextInputManager();
-  if (!!text_input_manager && !!text_input_manager->GetActiveWidget())
-    text_input_manager->GetActiveWidget()->ImeFinishComposingText(false);
+  // RenderWidgetHostViewAura keeps track of existing composition texts. The
+  // call to finish composition text should be made through the RWHVA itself
+  // otherwise the following call to cancel composition will lead to an extra
+  // IPC for finishing the ongoing composition (see https://crbug.com/723024).
+  host_view_->GetTextInputClient()->ConfirmCompositionText();
   host_view_->ImeCancelComposition();
 }