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

tracing/tracing/metrics/system_health/memory_metric.html

Index: tracing/tracing/metrics/system_health/memory_metric.html
diff --git a/tracing/tracing/metrics/system_health/memory_metric.html b/tracing/tracing/metrics/system_health/memory_metric.html
index 7e6067d781b4358f7be077f267954ed276ea87cc..e7291f5d21b8893af412dd00e3fd2dcf5b70c30f 100644
--- a/tracing/tracing/metrics/system_health/memory_metric.html
+++ b/tracing/tracing/metrics/system_health/memory_metric.html
@@ -6,8 +6,8 @@ found in the LICENSE file.
 -->
 
 <link rel="import" href="/tracing/base/iteration_helpers.html">
+<link rel="import" href="/tracing/base/math/range.html">
 <link rel="import" href="/tracing/base/multi_dimensional_view.html">
-<link rel="import" href="/tracing/base/range.html">
 <link rel="import" href="/tracing/base/unit.html">
 <link rel="import" href="/tracing/metrics/metric_registry.html">
 <link rel="import" href="/tracing/metrics/system_health/chrome_processes.html">
@@ -68,8 +68,8 @@ tr.exportTo('tr.metrics.sh', function() {
    *
    * @param {!tr.Model} model The trace model from which the global dumps
    *     should be extracted.
-   * @param {!tr.b.Range=} opt_rangeOfInterest If proided, global memory dumps
-   *     that do not inclusively intersect the range will be skipped.
+   * @param {!tr.b.math.Range=} opt_rangeOfInterest If proided, global memory
+   *     dumps that do not inclusively intersect the range will be skipped.
    * @return {!Map<string, !Array<!tr.model.GlobalMemoryDump>} A map from
    *     browser names to the associated global memory dumps.
    */