predictors: Refactor resource_prefetch_predictor triggering.

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 64976c57d964e65054c767e286bd10cc0bc0b81d..01a393cc8b1a0f448d85046c8c759f151899f948 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -694,6 +694,8 @@ split_static_library("browser") {
     "net/file_downloader.h",
     "net/http_server_properties_manager_factory.cc",
     "net/http_server_properties_manager_factory.h",
+    "net/loading_predictor_observer.cc",
+    "net/loading_predictor_observer.h",
     "net/net_error_diagnostics_dialog.h",
     "net/net_error_diagnostics_dialog_mac.cc",
     "net/net_error_diagnostics_dialog_win.cc",
@@ -721,8 +723,6 @@ split_static_library("browser") {
     "net/referrer.h",
     "net/request_source_bandwidth_histograms.cc",
     "net/request_source_bandwidth_histograms.h",
-    "net/resource_prefetch_predictor_observer.cc",
-    "net/resource_prefetch_predictor_observer.h",
     "net/safe_search_util.cc",
     "net/safe_search_util.h",
     "net/sdch_owner_pref_storage.cc",