Split SdchManager::Dictionary out into separate class/file.

net/filter/sdch_filter_unittest.cc

Index: net/filter/sdch_filter_unittest.cc
diff --git a/net/filter/sdch_filter_unittest.cc b/net/filter/sdch_filter_unittest.cc
index 4ba38d5d06f31dd90dc7937cd41486f89f1cbf76..09bda23a50bca70083bbbff3ea240e2fccd4b3cd 100644
--- a/net/filter/sdch_filter_unittest.cc
+++ b/net/filter/sdch_filter_unittest.cc
@@ -12,6 +12,8 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/test/simple_test_clock.h"
 #include "net/base/io_buffer.h"
+#include "net/base/sdch_dictionary.h"
+#include "net/base/sdch_manager.h"
 #include "net/base/sdch_observer.h"
 #include "net/filter/mock_filter_context.h"
 #include "net/filter/sdch_filter.h"
@@ -1211,9 +1213,8 @@ TEST_F(SdchFilterTest, UnexpectedDictionary) {
   ASSERT_TRUE(hash_set);
   ASSERT_EQ(SDCH_OK, problem_code);
 
-  const_cast<SdchManager::Dictionary*>(
-      hash_set->GetDictionary(server_hash))->SetClockForTesting(
-      clock.Pass());
+  const_cast<SdchDictionary*>(hash_set->GetDictionary(server_hash))
+      ->SetClockForTesting(clock.Pass());
 
   // Encode output with the second dictionary.
   std::string sdch_compressed(NewSdchCompressedData(expired_dictionary));