media: Fix CdmPathsTest test expectation on ARM64

Bug: 1128458
Change-Id: I0a08be5ccb2e245134b12f264b90ccd2376cd2ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2413207
Commit-Queue: John Rummell <jrummell@chromium.org>
Auto-Submit: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807510}

media/cdm/cdm_paths_unittest.cc

@@ -51,6 +51,8 @@ const char kComponentArch[] =
     "x64";
 #elif defined(ARCH_CPU_ARMEL)
     "arm";
+#elif defined(ARCH_CPU_ARM64)
+    "arm64";
 #else
     "unsupported_arch";
 #endif