predictors: Remove unused field trial configuration parsing.

chrome/browser/predictors/resource_prefetch_common.h

Index: chrome/browser/predictors/resource_prefetch_common.h
diff --git a/chrome/browser/predictors/resource_prefetch_common.h b/chrome/browser/predictors/resource_prefetch_common.h
index 33812ff5183a9975a1ca432698b828bb81cab67c..cfb422ce1fb715c8bb9c42e486e3043914e94d31 100644
--- a/chrome/browser/predictors/resource_prefetch_common.h
+++ b/chrome/browser/predictors/resource_prefetch_common.h
@@ -69,10 +69,10 @@ struct ResourcePrefetchPredictorConfig {
 
   // The mode the prefetcher is running in. Forms a bit map.
   enum Mode {
-    URL_LEARNING    = 1 << 0,
-    HOST_LEARNING   = 1 << 1,
+    URL_LEARNING = 1 << 0,
+    HOST_LEARNING = 1 << 1,
     URL_PREFETCHING = 1 << 2,  // Should also turn on URL_LEARNING.
-    HOST_PRFETCHING = 1 << 3   // Should also turn on HOST_LEARNING.
+    HOST_PREFETCHING = 1 << 3  // Should also turn on HOST_LEARNING.
   };
   int mode;