Forward handling of low-mem message to the content renderer client. Add APIs to handle this case.

chrome/renderer/spellchecker/spellcheck.cc

Index: chrome/renderer/spellchecker/spellcheck.cc
diff --git a/chrome/renderer/spellchecker/spellcheck.cc b/chrome/renderer/spellchecker/spellcheck.cc
index c9e3405735b4013ad60678857f48df5b7e80b73b..818182d43a3d3a519e58fe6815040802ffb55bc0 100644
--- a/chrome/renderer/spellchecker/spellcheck.cc
+++ b/chrome/renderer/spellchecker/spellcheck.cc
@@ -36,18 +36,13 @@ bool SpellCheck::OnControlMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
-  if (message.type() == ViewMsg_PurgeMemory::ID) {
-    delete this;
-    new SpellCheck();
-  }
-
   return handled;
 }
 
 void SpellCheck::OnInit(IPC::PlatformFileForTransit bdict_file,
                         const std::vector<std::string>& custom_words,
                         const std::string& language,
-    bool auto_spell_correct) {
+                        bool auto_spell_correct) {
   Init(IPC::PlatformFileForTransitToPlatformFile(bdict_file),
        custom_words, language);
   auto_spell_correct_turned_on_ = auto_spell_correct;