Make SpellCheckPanel compiled and used only on Mac

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 6323036503bc8aea513bf7b928abd32d94b5de08..6183e98894f5539d3034669c7f805173abdcc2ca 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -164,8 +164,11 @@
 
 #if BUILDFLAG(ENABLE_SPELLCHECK)
 #include "components/spellcheck/renderer/spellcheck.h"
-#include "components/spellcheck/renderer/spellcheck_panel.h"
 #include "components/spellcheck/renderer/spellcheck_provider.h"
+
+#if BUILDFLAG(HAS_SPELLCHECK_PANEL)
+#include "components/spellcheck/renderer/spellcheck_panel.h"
+#endif

[Lei Zhang, 2017/04/14 00:55:38]

Which #endif is which? Once you have nested #ifs, I would recommend adding
comments to them.

[Xiaocheng, 2017/04/14 01:20:18]

Done.

 #endif
 
 #if BUILDFLAG(ENABLE_WEBRTC)
@@ -596,8 +599,11 @@ void ChromeContentRendererClient::RenderViewCreated(
   if (SpellCheckProvider* provider =
           SpellCheckProvider::Get(render_view->GetMainRenderFrame()))
     provider->EnableSpellcheck(spellcheck_->IsSpellcheckEnabled());
+
+#if BUILDFLAG(HAS_SPELLCHECK_PANEL)
   new SpellCheckPanel(render_view);
 #endif
+#endif
   new prerender::PrerendererClient(render_view);
 
   new ChromeRenderViewObserver(render_view, web_cache_impl_.get());