Add Widevine signature files into Mac build

chrome/common/media/cdm_host_file_path.cc

Index: chrome/common/media/cdm_host_file_path.cc
diff --git a/chrome/common/media/cdm_host_file_path.cc b/chrome/common/media/cdm_host_file_path.cc
index ea1974fdcfa18fe032503361e4ce81e05d643e40..99c49fac13bbf384af93e009eee8b700d152c2f2 100644
--- a/chrome/common/media/cdm_host_file_path.cc
+++ b/chrome/common/media/cdm_host_file_path.cc
@@ -80,11 +80,14 @@ void AddCdmHostFilePaths(
 #elif defined(OS_MACOSX)
 
   // Framework signature is next to the framework directory, not next to
-  // the actual framework executable.
+  // the actual framework executable. As the framework is now internally

[sky, 2017/02/22 17:00:07]

Isn't there a better way to get the location rather than assuming you have to go
up three directories? Maybe DIR_EXE?

[jrummell, 2017/02/22 23:14:51]

It turns out that with the symlinks added it still thinks it's in the original
directory, so I've reverted this change.

+  // versioned, the signature file is up three directories. Chrome also
+  // externally versions the framework, so there will only ever be one
+  // internal version of the framework per outer version directory.
   base::FilePath chrome_framework_path =
       base::mac::FrameworkBundlePath().Append(chrome::kFrameworkExecutableName);
-  base::FilePath chrome_framework_sig_path =
-      GetSigFilePath(base::mac::FrameworkBundlePath().DirName().Append(
+  base::FilePath chrome_framework_sig_path = GetSigFilePath(
+      base::mac::FrameworkBundlePath().DirName().DirName().DirName().Append(
           chrome::kFrameworkExecutableName));
 
   DVLOG(2) << __func__