Fix linker errors with test_support_chromiumcontent.lib
Fix linker errors with test_support_chromiumcontent.lib

We need to tell the compiler/linker to import symbols that are exported
by chromiumcontent.dll rather than trying to export them again.

bbondy/libchromiumcontent,synaptek/libchromiumcontent,eric-seekas/libchromiumcontent,deepak1556/libchromiumcontent,bbondy/libchromiumcontent,brave/libchromiumcontent,paulcbetts/libchromiumcontent,atom/libchromiumcontent,atom/libchromiumcontent,jlord/libchromiumcontent,zhanggyb/libchromiumcontent,adamjgray/libchromiumcontent,paulcbetts/libchromiumcontent,hokein/libchromiumcontent,brave/libchromiumcontent,eric-seekas/libchromiumcontent,adamjgray/libchromiumcontent,synaptek/libchromiumcontent,electron/libchromiumcontent,jlord/libchromiumcontent,zhanggyb/libchromiumcontent,electron/libchromiumcontent,hokein/libchromiumcontent,deepak1556/libchromiumcontent