Use LoadLibraryEx() instead of SetDllDirectory() for overriding DLL loading path.
Use LoadLibraryEx() instead of SetDllDirectory() for overriding DLL loading path.

BUG=35857
TEST=install a real version of chrome (don't simply unzip a build). close chrome. create an empty file named C:\Windows\avutil-50.dll. start chrome and go to www.youtube.com/html5. no error dialog box should appear. repeat these steps with an earlier version of chrome to verify that an error dialog box appears complaining about C:\Windows\avutil-50.dll.
Review URL: http://codereview.chromium.org/2853018

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@51304 0039d316-1c4b-4281-b951-d872f2087c98

adobe/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,yitian134/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,ropik/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,ropik/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,adobe/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,adobe/chromium,adobe/chromium,Crystalnix/house-of-life-chromium