Fix painting issue with maximize button in aura.
Fix painting issue with maximize button in aura.

Fix invalid transition in custom_button.cc When the mouse is released on a custom button, the state is set to BS_NORMAL if the hit test fails.
The following two transitions should have the same final effect.
BS_PRESSED -> BS_HOT -> BS_NORMAL
BS_PRESSED -> BS_NORMAL

Review URL: http://codereview.chromium.org/8437003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@108671 0039d316-1c4b-4281-b951-d872f2087c98

ropik/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,adobe/chromium,ropik/chromium,adobe/chromium,ropik/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,ropik/chromium