Restructure SDCH layering to allow more separation (observer/1->[0,n]

net/net.gypi

Index: net/net.gypi
diff --git a/net/net.gypi b/net/net.gypi
index 36aa3e6247354bb88e2f275b1e5d75dccc616b1a..10fad827732403217bde65252a219ebeb8dc8e6e 100644
--- a/net/net.gypi
+++ b/net/net.gypi
@@ -268,10 +268,10 @@
       'base/proxy_delegate.h',
       'base/request_priority.cc',
       'base/request_priority.h',
-      'base/sdch_dictionary_fetcher.cc',
-      'base/sdch_dictionary_fetcher.h',
       'base/sdch_manager.cc',
       'base/sdch_manager.h',
+      'base/sdch_observer.cc',
+      'base/sdch_observer.h',
       'base/static_cookie_policy.cc',
       'base/static_cookie_policy.h',
       'base/test_data_stream.cc',
@@ -1128,6 +1128,8 @@
       'url_request/http_user_agent_settings.h',
       'url_request/redirect_info.cc',
       'url_request/redirect_info.h',
+      'url_request/sdch_dictionary_fetcher.cc',
+      'url_request/sdch_dictionary_fetcher.h',
       'url_request/static_http_user_agent_settings.cc',
       'url_request/static_http_user_agent_settings.h',
       'url_request/url_fetcher.cc',
@@ -1285,7 +1287,6 @@
       'base/prioritized_dispatcher_unittest.cc',
       'base/priority_queue_unittest.cc',
       'base/registry_controlled_domains/registry_controlled_domain_unittest.cc',
-      'base/sdch_dictionary_fetcher_unittest.cc',
       'base/sdch_manager_unittest.cc',
       'base/static_cookie_policy_unittest.cc',
       'base/test_completion_callback_unittest.cc',
@@ -1683,6 +1684,7 @@
       'tools/dump_cache/url_utilities_unittest.cc',
       'tools/tld_cleanup/tld_cleanup_util_unittest.cc',
       'udp/udp_socket_unittest.cc',
+      'url_request/sdch_dictionary_fetcher_unittest.cc',
       'url_request/url_fetcher_impl_unittest.cc',
       'url_request/url_fetcher_response_writer_unittest.cc',
       'url_request/url_request_context_builder_unittest.cc',