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

chrome/renderer/spellchecker/spellcheck_provider.cc

Index: chrome/renderer/spellchecker/spellcheck_provider.cc
diff --git a/chrome/renderer/spellchecker/spellcheck_provider.cc b/chrome/renderer/spellchecker/spellcheck_provider.cc
index c92f47a36a829a041e08c69c22aa41b588bc660e..70d32ef1fb8b9e0b7b8cb8cd98c78c8b0b0f5a38 100644
--- a/chrome/renderer/spellchecker/spellcheck_provider.cc
+++ b/chrome/renderer/spellchecker/spellcheck_provider.cc
@@ -202,3 +202,7 @@ void SpellCheckProvider::EnsureDocumentTag() {
   }
 #endif
 }
+
+void SpellCheckProvider::SetSpellCheck(SpellCheck* spellcheck) {
+  spellcheck_ = spellcheck;
+}