Create a spellcheck component that will allow any embedder to reuse common functionality.

chrome/browser/spellchecker/spellcheck_message_filter.h

Index: chrome/browser/spellchecker/spellcheck_message_filter.h
diff --git a/chrome/browser/spellchecker/spellcheck_message_filter.h b/chrome/browser/spellchecker/spellcheck_message_filter.h
index 43671a89959c7522ad9923d78f5b1b3804dccd49..bd0b8f629251d7f5e7ac814d0f24b7832a35a267 100644
--- a/chrome/browser/spellchecker/spellcheck_message_filter.h
+++ b/chrome/browser/spellchecker/spellcheck_message_filter.h
@@ -12,9 +12,12 @@
 #include "chrome/browser/spellchecker/spelling_service_client.h"
 #include "content/public/browser/browser_message_filter.h"
 
-class SpellCheckMarker;
 class SpellcheckService;
+
+namespace spellcheck {
+class SpellCheckMarker;
 struct SpellCheckResult;
+}
 
 // A message filter implementation that receives spell checker requests from
 // SpellCheckProvider.
@@ -39,17 +42,17 @@ class SpellCheckMessageFilter : public content::BrowserMessageFilter {
   void OnCallSpellingService(int route_id,
                              int identifier,
                              const base::string16& text,
-                             std::vector<SpellCheckMarker> markers);
+                             std::vector<spellcheck::SpellCheckMarker> markers);
 
   // A callback function called when the Spelling service finishes checking
   // text. Sends the given results to a renderer.
   void OnTextCheckComplete(
       int route_id,
       int identifier,
-      const std::vector<SpellCheckMarker>& markers,
+      const std::vector<spellcheck::SpellCheckMarker>& markers,
       bool success,
       const base::string16& text,
-      const std::vector<SpellCheckResult>& results);
+      const std::vector<spellcheck::SpellCheckResult>& results);
 
   // Checks the user profile and sends a JSON-RPC request to the Spelling
   // service if a user enables the "Ask Google for suggestions" option. When we
@@ -61,7 +64,7 @@ class SpellCheckMessageFilter : public content::BrowserMessageFilter {
       const base::string16& text,
       int route_id,
       int identifier,
-      const std::vector<SpellCheckMarker>& markers);
+      const std::vector<spellcheck::SpellCheckMarker>& markers);
 #endif
 
   // Can be overridden for testing.