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Revert of Make extensions that desire to act pop out if in overflow (patchset #6 id:200001 of https://codereview.chromium.org/675023002/)

Reason for revert:
Suspect this patch of causing errors on linux valgrind for LocationBarControllerUnitTest.NavigationClearsState.

http://build.chromium.org/p/chromium.memory.fyi/builders/Linux%20Tests%20%28valgrind%29%285%29/builds/31337

Sample valgrind output:
Suppression (error hash=#606630BA25518095#):
For more info on using suppressions see http://dev.chromium.org/developers/tree-sheriffs/sheriff-details-chromium/memory-sheriff#TOC-Suppressing-memory-reports
{
<insert_a_suppression_name_here>
Memcheck:Unaddressable
fun:_ZN16ExtensionService21NotifyExtensionLoadedEPKN10extensions9ExtensionE
fun:_ZN16ExtensionService12AddExtensionEPKN10extensions9ExtensionE
fun:_ZN10extensions12_GLOBAL__N_129LocationBarControllerUnitTest12AddExtensionEbRKSs
fun:_ZN10extensions12_GLOBAL__N_156LocationBarControllerUnitTest_NavigationClearsState_Test8TestBodyEv
}

Original issue's description:
> Make extensions that desire to act pop out if in overflow
>
> If an extension desires to act, it should pop itself out of
> the overflow menu.  There should also be a visual queue for
> extensions that are already visible, but what exactly that
> should be is still being discussed.
>
> BUG=417441
>
> Committed: https://crrev.com/d604171517135387ca3b4c33d7f1774c8d2d38b0
> Cr-Commit-Position: refs/heads/master@{#302511}

TBR=finnur@chromium.org,pkasting@chromium.org,rdevlin.cronin@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=417441

Review URL: https://codereview.chromium.org/700453003

Cr-Commit-Position: refs/heads/master@{#302563}