Revert of [Telemetry] Modify CreatePageSet to CreateStorySet

Revert of [Telemetry] Modify CreatePageSet to CreateStorySet (patchset #2 id:20001 of https://codereview.chromium.org/1217813005/)

Reason for revert:
Speculative revert to attempt to address extreme long-running telemetry jobs.  See http://crbug.com/505867 for details.

Original issue's description:
> [Telemetry] Modify CreatePageSet to CreateStorySet
> 
> BUG=465594
> 
> Committed: https://crrev.com/8af27d5cf40ebe4590fd5cc65880c9ab8b632ba4
> Cr-Commit-Position: refs/heads/master@{#336713}

TBR=eakuefner@chromium.org,aiolos@chromium.org,kbr@chromium.org,nednguyen@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=465594, 505867

[Rick Byers, 2015-06-30 18:45:13]

Created Revert of [Telemetry] Modify CreatePageSet to CreateStorySet

[commit-bot: I haz the power, 2015-06-30 18:48:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1217653003/1

[commit-bot: I haz the power, 2015-06-30 18:50:52]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-30 18:50:54]

Failed to apply patch for content/test/gpu/gpu_tests/context_lost.py:
While running git apply --index -3 -p1;
  error: patch failed: content/test/gpu/gpu_tests/context_lost.py:332
  Falling back to three-way merge...
  Applied patch to 'content/test/gpu/gpu_tests/context_lost.py' with conflicts.
  U content/test/gpu/gpu_tests/context_lost.py

Patch:       content/test/gpu/gpu_tests/context_lost.py
Index: content/test/gpu/gpu_tests/context_lost.py
diff --git a/content/test/gpu/gpu_tests/context_lost.py
b/content/test/gpu/gpu_tests/context_lost.py
index
16aaf7d2ff4fc7a31a17e78fe2508c21d573120c..6b8d64b53d778f7042cd62195e1b58f692c57da1
100644
--- a/content/test/gpu/gpu_tests/context_lost.py
+++ b/content/test/gpu/gpu_tests/context_lost.py
@@ -332,7 +332,7 @@
   # For the record, this would have been another way to get the pages
   # to repeat. pageset_repeat would be another option.
   # options = {'page_repeat': 5}
-  def CreateStorySet(self, options):
+  def CreatePageSet(self, options):
     ps = page_set.PageSet(
       base_dir=data_path,
       serving_dirs=set(['']))