Cruft removal: remove some unused locals and parameters.

R=dimvar
DELTA=336 (6 added, 108 deleted, 222 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6092


git-svn-id: http://closure-compiler.googlecode.com/svn/trunk@2447 b0f006be-c8cd-11de-a2e8-8d36a3108c74

Fix a normalization verifcation bug discovered when reviewing unused variables.

R=dimvar
DELTA=43 (33 added, 3 deleted, 7 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6093


git-svn-id: http://closure-compiler.googlecode.com/svn/trunk@2448 b0f006be-c8cd-11de-a2e8-8d36a3108c74

Refactor PerformanceTracker and allow tracking of negative diffs for size increases.

R=acleung
DELTA=139 (49 added, 46 deleted, 44 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=6094


git-svn-id: http://closure-compiler.googlecode.com/svn/trunk@2449 b0f006be-c8cd-11de-a2e8-8d36a3108c74