Use a different algorithm with the low entropy source for field trials.

chrome/browser/chrome_browser_main_unittest.cc

Index: chrome/browser/chrome_browser_main_unittest.cc
===================================================================
--- chrome/browser/chrome_browser_main_unittest.cc	(revision 151948)
+++ chrome/browser/chrome_browser_main_unittest.cc	(working copy)
@@ -38,6 +38,7 @@
   ChromeBrowserMainParts* cbw = static_cast<ChromeBrowserMainParts*>(bw.get());
   EXPECT_TRUE(cbw);
   if (cbw) {
+    base::FieldTrialList field_trial_list_(NULL);

[SteveT, 2012/08/16 20:55:42]

This is to avoid that test error you saw earlier where the FTL was defined out
of order?

[Alexei Svitkine (slow), 2012/08/16 21:27:11]

Right. Basically, the issue is that this test (and also the variations_util
test) end up using FieldTrialList statics without creating a FieldTrialList.
This ends up setting FieldTrialList::used_without_global_ = true, but that's
only checked the next time a FieldTrialList is created. So it ends up blowing up
the next test that does instantiate a FieldTrialList - such as the
EntropyProviderTest. This change fixes the issue.

     cbw->browser_field_trials_.WarmConnectionFieldTrial();
     EXPECT_EQ(0, net::GetSocketReusePolicy());
   }
@@ -53,6 +54,7 @@
   if (cbw) {
     const int kNumRuns = 1000;
     for (int i = 0; i < kNumRuns; i++) {
+      base::FieldTrialList field_trial_list_(NULL);
       cbw->browser_field_trials_.WarmConnectionFieldTrial();
       int val = net::GetSocketReusePolicy();
       EXPECT_LE(val, 2);