Replace variable name |runner| with |task|

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Review URL: https://codereview.appspot.com/133550043

Author: hiroshige-g

src/example/benchmark.html

@@ -210,13 +210,13 @@
 }
 
 function runNextTask() {
-  var runner = tasks.shift();
-  if (runner == undefined) {
+  var task = tasks.shift();
+  if (task == undefined) {
     addToLog('Finished');
     destroyAllSockets();
     return;
   }
-  timerID = setTimeout(runner, 0);
+  timerID = setTimeout(task, 0);
 }
 
 function buildLegendString(config) {
@@ -259,11 +259,11 @@
     for (var size = config.startSize;
          size <= config.stopThreshold;
          ++multiplierIndex) {
-      var runner = stepFunc.bind(
+      var task = stepFunc.bind(
           null,
           size,
           config);
-      tasks.push(runner);
+      tasks.push(task);
       size *= config.multipliers[
           multiplierIndex % config.multipliers.length];
     }

src/example/xhr_benchmark.html

@@ -316,11 +316,11 @@
     for (var size = config.startSize;
          size <= config.stopThreshold;
          ++multiplierIndex) {
-      var runner = stepFunc.bind(
+      var task = stepFunc.bind(
           null,
           size,
           config);
-      tasks.push(runner);
+      tasks.push(task);
       size *= config.multipliers[
           multiplierIndex % config.multipliers.length];
     }