Replace ASSERT by RTC_DCHECK in all non-test code.

webrtc/base/applefilesystem.mm

Index: webrtc/base/applefilesystem.mm
diff --git a/webrtc/base/applefilesystem.mm b/webrtc/base/applefilesystem.mm
index 9f015edf071502e02f24d1f9f7e8994388a88c55..04b6cdfc3a2e0a6538454fcd393e7ef274063094 100644
--- a/webrtc/base/applefilesystem.mm
+++ b/webrtc/base/applefilesystem.mm
@@ -16,6 +16,7 @@
 #import <Foundation/NSProcessInfo.h>
 #include <string.h>
 
+#include "webrtc/base/checks.h"
 #include "webrtc/base/common.h"
 #include "webrtc/base/pathutils.h"
 
@@ -36,7 +37,7 @@ static char* copyString(NSString* s) {
 char* AppleDataDirectory() {
   NSArray* paths = NSSearchPathForDirectoriesInDomains(
       NSApplicationSupportDirectory, NSUserDomainMask, YES);
-  ASSERT([paths count] == 1);
+  RTC_DCHECK([paths count] == 1);
   return copyString([paths objectAtIndex:0]);
 }