Changes to fix new warnings introduced by better type inferrencing of Array.prototype methods

Tested:
yes

R=eparker
DELTA=9 (0 added, 0 deleted, 9 changed)


Revision created by MOE tool push_codebase.
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git-svn-id: http://closure-compiler.googlecode.com/svn/trunk@2460 b0f006be-c8cd-11de-a2e8-8d36a3108c74
Add check that there are no duplicates in prevUsedRenameMap.

R=acleung,johnlenz
DELTA=53 (50 added, 0 deleted, 3 changed)


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MOE_MIGRATION=6134

git-svn-id: http://closure-compiler.googlecode.com/svn/trunk@2461 b0f006be-c8cd-11de-a2e8-8d36a3108c74
Correct typo.

R=nicksantos
DELTA=3 (0 added, 2 deleted, 1 changed)


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git-svn-id: http://closure-compiler.googlecode.com/svn/trunk@2462 b0f006be-c8cd-11de-a2e8-8d36a3108c74
Make dead-code elimination go to a fixpt.

R=acleung
DELTA=91 (32 added, 18 deleted, 41 changed)


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git-svn-id: http://closure-compiler.googlecode.com/svn/trunk@2463 b0f006be-c8cd-11de-a2e8-8d36a3108c74
Externs for Maps API v3.11.6.

R=lukem
DELTA=164 (10 added, 0 deleted, 154 changed)


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git-svn-id: http://closure-compiler.googlecode.com/svn/trunk@2464 b0f006be-c8cd-11de-a2e8-8d36a3108c74