[Tests not passing yet] Remove prerender sessionStorage namespace merging.

chrome/browser/prerender/prerender_field_trial.cc

Index: chrome/browser/prerender/prerender_field_trial.cc
diff --git a/chrome/browser/prerender/prerender_field_trial.cc b/chrome/browser/prerender/prerender_field_trial.cc
index 02ed0222a9c73bcb760f9243749b1d3e5fc8ffaf..10afe5cb1489c981e315dddd341ff38aee5a2589 100644
--- a/chrome/browser/prerender/prerender_field_trial.cc
+++ b/chrome/browser/prerender/prerender_field_trial.cc
@@ -80,8 +80,6 @@ const int kDefaultPrefetchListTimeoutSeconds = 300;
 const char kSkipPrerenderLocalCanadidates[] = "SkipPrerenderLocalCandidates";
 const char kSkipPrerenderServiceCanadidates[] =
     "SkipPrerenderServiceCandidates";
-const char kDisableSessionStorageNamespaceMerging[] =
-    "DisableSessionStorageNamespaceMerging";
 const char kPrerenderCookieStore[] = "PrerenderCookieStore";
 
 void SetupPrerenderFieldTrial() {
@@ -481,11 +479,6 @@ bool SkipLocalPredictorServiceCandidates() {
       kEnabledGroup;
 }
 
-bool ShouldMergeSessionStorageNamespaces() {
-  return GetLocalPredictorSpecValue(kDisableSessionStorageNamespaceMerging) !=
-      kDisabledGroup;
-}
-
 bool IsPrerenderCookieStoreEnabled() {
   return GetLocalPredictorSpecValue(kPrerenderCookieStore) != kDisabledGroup &&
       FieldTrialList::FindFullName(kPrerenderCookieStore) != kDisabledGroup;