[tracing] Move math utilities from base into their own subdirectory (attempt 2)

tracing/tracing/model/resource_usage_sample_test.html

Index: tracing/tracing/model/resource_usage_sample_test.html
diff --git a/tracing/tracing/model/resource_usage_sample_test.html b/tracing/tracing/model/resource_usage_sample_test.html
index 26e3338149962105a8fc097266230c44f7eb46aa..af51aec1eb132f4fd4de5e0002425236d3ef73fa 100644
--- a/tracing/tracing/model/resource_usage_sample_test.html
+++ b/tracing/tracing/model/resource_usage_sample_test.html
@@ -5,7 +5,7 @@ Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
-<link rel="import" href="/tracing/base/range.html">
+<link rel="import" href="/tracing/base/math/range.html">
 <link rel="import" href="/tracing/model/model.html">
 <link rel="import" href="/tracing/model/resource_usage_sample.html">
 
@@ -36,7 +36,7 @@ tr.b.unittest.testSuite(function() {
     var sample1 = new ResourceUsageSample(series, 0.0, 0.11);
     var sample2 = new ResourceUsageSample(series, 1.0, 0.22);
 
-    var range = new tr.b.Range();
+    var range = new tr.b.math.Range();
     sample1.addBoundsToRange(range);
 
     assert.equal(range.min, 0);