Actually fix the rawhide tolerance bug.

And undo the last two botched CLs.

Thanks to Chris Sweeney and Taylor Braun Jones for saving my bacon.
I will do appropriate penance to repend for my sins.

Change-Id: I14de958e651f85e4c1741fba2cb46ffe7e873346

internal/ceres/polynomial_test.cc

diff --git a/internal/ceres/polynomial_test.cc b/internal/ceres/polynomial_test.cc
index f2fd19e..d7026ed 100644
--- a/internal/ceres/polynomial_test.cc
+++ b/internal/ceres/polynomial_test.cc
@@ -167,7 +167,7 @@
 
 TEST(Polynomial, QuadraticPolynomialWithCloseRootsWorks) {
   const double roots[2] = { 42.42, 42.43 };
-  RunPolynomialTestRealRoots(roots, true, false, 2 * kEpsilonLoose);
+  RunPolynomialTestRealRoots(roots, true, false, kEpsilonLoose);
 }
 
 TEST(Polynomial, QuadraticPolynomialWithComplexRootsWorks) {
@@ -200,7 +200,7 @@
 
 TEST(Polynomial, QuarticPolynomialWithTwoZeroRootsWorks) {
   const double roots[4] = { -42.42, 0.0, 0.0, 42.42 };
-  RunPolynomialTestRealRoots(roots, true, true, kEpsilonLoose);
+  RunPolynomialTestRealRoots(roots, true, true, 2 * kEpsilonLoose);
 }
 
 TEST(Polynomial, QuarticMonomialWorks) {