Revert of Add diagnostic logspew to help study inspector_importer flake. (https://codereview.chromium.org/147353004/)

Reason for revert:
Test flakes since this landed:
http://build.chromium.org/p/chromium.win/buildstatus?builder=Vista%20Tests%20%282%29&number=41142
http://build.chromium.org/p/chromium.win/buildstatus?builder=Vista%20Tests%20%282%29&number=41143
http://build.chromium.org/p/chromium.win/buildstatus?builder=XP%20Tests%20%282%29&number=32849
http://build.chromium.org/p/chromium.win/buildstatus?builder=XP%20Tests%20%282%29&number=32850

Output is something like

LoadingTimelineUnitTest.testLoadingTimelineBasic: 
While importing raw_event={"data": {}, "endTime": 1390660695305.004, "type": "Program", "children": [{"data": {"id": 0}, "type": "BeginFrame", "startTime": 1390660695295.004}, {"data": {"rootNode": -3}, "endTime": 1390660694493.086, "type": "PaintSetup", "startTime": 1390660694492.973}, {"type": "Paint", "frameId": "53228.1", "startTime": 1390660695298.004, "endTime": 1390660695301.004, "data": {"rootNode": -3, "clip": [0, 0, 1018, 0, 1018, 764, 0, 764], "layerId": 10}, "children": []}, {"data": {}, "endTime": 1390660695305.004, "type": "CompositeLayers", "children": [], "startTime": 1390660695301.004}, {"data": {}, "type": "MarkFirstPaint", "startTime": 1390660695305.004}], "startTime": 1390660695295.004}:\sWARNING:root:While running file://scrollable_page.html
Traceback (most recent call last):
File "E:\b\build\slave\Vista_Tests__2_\build\src\tools\perf\measurements\loading_timeline_unittest.py", line 20, in testLoadingTimelineBasic
self.assertEquals(0, len(results.failures))
AssertionError: 0 != 1


Original issue's description:
> Add diagnostic logspew to help study inspector_importer flake.
> 
> BUG=321529
> TBR=tonyg
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=247110

TBR=tonyg@chromium.org,nduca@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=321529

Review URL: https://codereview.chromium.org/139693005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247135 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247135