Add BASE_API to the remaining functions in linux_util.
Add BASE_API to the remaining functions in linux_util.

These symbols are used by chrome/browser/crash_handler_host_linux.cc when building with branding==Chrome, so they need to be exported for shared-library builds to work in that configuration.

BUG=none
TEST=builds

Review URL: http://codereview.chromium.org/7076007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@86782 0039d316-1c4b-4281-b951-d872f2087c98

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