SpellCheck: the custom dictionary should be per profile.

chrome/browser/spellchecker/spellcheck_profile.h

Index: chrome/browser/spellchecker/spellcheck_profile.h
diff --git a/chrome/browser/spellchecker/spellcheck_profile.h b/chrome/browser/spellchecker/spellcheck_profile.h
index 7a7bf0d511aca8cd8ba34b7f3e735de0823670ef..d827c4966075157ca04db4b8e232471f9c8bcfe6 100644
--- a/chrome/browser/spellchecker/spellcheck_profile.h
+++ b/chrome/browser/spellchecker/spellcheck_profile.h
@@ -9,6 +9,7 @@
 #include <string>
 #include <vector>
 
+#include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/spellchecker/spellcheck_profile_provider.h"
@@ -56,7 +57,7 @@ class SpellCheckProfile : public SpellCheckProfileProvider {
     REINITIALIZE_DID_NOTHING
   };
 
-  SpellCheckProfile();
+  explicit SpellCheckProfile(const FilePath& profile_dir);
   virtual ~SpellCheckProfile();
 
   // Retrieves SpellCheckHost object.
@@ -86,6 +87,10 @@ class SpellCheckProfile : public SpellCheckProfileProvider {
   virtual const CustomWordList& GetCustomWords() const;
   virtual void CustomWordAddedLocally(const std::string& word);
 
+  // Methods about custom dictionary.
+  virtual void LoadCustomDictionary(CustomWordList* custom_words);
+  virtual void WriteWordToCustomDictionary(const std::string& word);
+
  protected:
   // Only tests should override this.
   virtual SpellCheckHost* CreateHost(
@@ -107,6 +112,9 @@ class SpellCheckProfile : public SpellCheckProfileProvider {
   // In-memory cache of the custom words file.
   scoped_ptr<CustomWordList> custom_words_;
 
+  // A path for custom dictionary per profile.
+  FilePath custom_dictionary_path_;
+
   DISALLOW_COPY_AND_ASSIGN(SpellCheckProfile);
 };