Revert of Blink roll 178929:178934

Revert of Blink roll 178929:178934 (https://codereview.chromium.org/417113005/)

Reason for revert:
Seems to have broken browser_tests:
DevToolsSanityTest.TestNoScriptDuplicatesOnPanelSwitch (run #4):
[ RUN      ] DevToolsSanityTest.TestNoScriptDuplicatesOnPanelSwitch
HTTP server started on http://127.0.0.1:52329...
sending server_data: {"host": "127.0.0.1", "port": 52329} (36 bytes)
../../chrome/browser/devtools/devtools_sanity_browsertest.cc:104: Failure
Value of: result
  Actual: "[FAILED] TypeError: Cannot read property 'sourcesView' of undefined"
Expected: "[OK]"

Original issue's description:
> Blink roll 178929:178934
> 
> http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=/trunk&range=178930:178934&mode=html
> TBR=haraken@chromium.org,jchaffraix@chromium.org
> BUG=
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285602

TBR=haraken@chromium.org,jchaffraix@chromium.org,blink-deps-roller@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285622

[dmichael (off chromium), 2014-07-25 18:37:49]

Created Revert of Blink roll 178929:178934

[commit-bot: I haz the power, 2014-07-25 18:38:18]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dmichael@chromium.org/414223006/1

[commit-bot: I haz the power, 2014-07-25 18:39:55]

Change committed as 285622