importer: use FilePath instead of wstring in some places

base/values.cc

Index: base/values.cc
diff --git a/base/values.cc b/base/values.cc
index 7e55739d8703992f5a6bf9ca5efb2b58a25c66d9..f78f4748d8bd0fcff9973bee460a99927228b789 100644
--- a/base/values.cc
+++ b/base/values.cc
@@ -354,6 +354,10 @@ bool DictionaryValue::HasKey(const std::wstring& key) const {
   return current_entry != dictionary_.end();
 }
 
+bool DictionaryValue::HasKeyASCII(const std::string& key) const {
+  return HasKey(ASCIIToWide(key));
+}
+
 void DictionaryValue::Clear() {
   ValueMap::iterator dict_iterator = dictionary_.begin();
   while (dict_iterator != dictionary_.end()) {
@@ -471,6 +475,26 @@ bool DictionaryValue::GetReal(const std::wstring& path,
   return value->GetAsReal(out_value);
 }
 
+bool DictionaryValue::GetString(const std::string& path,
+                                string16* out_value) const {
+  return GetStringAsUTF16(ASCIIToWide(path), out_value);
+}
+
+bool DictionaryValue::GetStringASCII(const std::string& path,
+                                     std::string* out_value) const {
+  std::string out;
+  if (!GetString(ASCIIToWide(path), &out))
+    return false;
+
+  if (!IsStringASCII(out)) {
+    NOTREACHED();
+    return false;
+  }
+
+  out_value->assign(out);
+  return true;
+}
+
 bool DictionaryValue::GetString(const std::wstring& path,
                                 std::string* out_value) const {
   Value* value;