Eliminate defines in talk/

talk/media/base/videocapturer.cc

Index: talk/media/base/videocapturer.cc
diff --git a/talk/media/base/videocapturer.cc b/talk/media/base/videocapturer.cc
index f40f41f956729078c0df359a916f274c7f2a2861..d525a4188edd2ac4ab6e2ee7b6bf9b3b4d6dc954 100644
--- a/talk/media/base/videocapturer.cc
+++ b/talk/media/base/videocapturer.cc
@@ -59,7 +59,7 @@ enum {
 };
 
 static const int64_t kMaxDistance = ~(static_cast<int64_t>(1) << 63);
-#ifdef LINUX
+#ifdef WEBRTC_LINUX
 static const int kYU12Penalty = 16;  // Needs to be higher than MJPG index.
 #endif
 static const int kDefaultScreencastFps = 5;
@@ -594,7 +594,7 @@ int64_t VideoCapturer::GetFormatDistance(const VideoFormat& desired,
     for (size_t i = 0; i < preferred_fourccs.size(); ++i) {
       if (supported_fourcc == CanonicalFourCC(preferred_fourccs[i])) {
         delta_fourcc = i;
-#ifdef LINUX
+#ifdef WEBRTC_LINUX
         // For HD avoid YU12 which is a software conversion and has 2 bugs
         // b/7326348 b/6960899.  Reenable when fixed.
         if (supported.height >= 720 && (supported_fourcc == FOURCC_YU12 ||