Enable crash symbols unit test for Mac OSX.

tools/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py

Index: tools/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py
diff --git a/tools/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py b/tools/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py
index 041de993f34800825391013ba347014e0fc14f96..c5804cfa81305c6d672b976db61b71297b4ab28d 100644
--- a/tools/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py
+++ b/tools/telemetry/telemetry/internal/backends/chrome/desktop_browser_backend.py
@@ -46,7 +46,12 @@ def GetSymbolBinary(executable, os_name):
                                     'Chromium Framework.framework',
                                     'Chromium Framework')
       if os.path.isfile(framework_file):
-        return framework_file
+        # Sometimes dyld returns symbols for a different file. Emulate what it
+        # does here by using the same mechanism to find the binary file.
+        import fcntl
+        F_GETPATH = 50
+        with open(framework_file, 'rb') as f:
+          return fcntl.fcntl(f.fileno(), F_GETPATH, b'\0' * 1024).rstrip(b'\0')
 
   return executable