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When compiling in Debug mode Win7/MSVS 2010 using
GYP_DEFINES="enable_webrtc=0 component=shared_library"
the compilation fails. This CL ensures these files are
not included when enable_webrtc=0.

BUG=284083
TEST=local compile.

Review URL: https://chromiumcodereview.appspot.com/23749003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222015 0039d316-1c4b-4281-b951-d872f2087c98