[Android] Only build relocation_packer_unittests on ARM and ARM64.

build/all.gyp

Index: build/all.gyp
diff --git a/build/all.gyp b/build/all.gyp
index 849d891c95922d041a97c0d385ae7e6a4642ced6..5ced5e96a1f66413e30c69b0a1914c1ec2dc649d 100644
--- a/build/all.gyp
+++ b/build/all.gyp
@@ -54,12 +54,19 @@
             '../chrome/chrome.gyp:chrome_shell_apk',
             '../remoting/remoting.gyp:remoting_apk',
             '../tools/telemetry/telemetry.gyp:*#host',
-            '../tools/relocation_packer/relocation_packer.gyp:relocation_packer_unittests#host',
             # TODO(nyquist) This should instead by a target for sync when all of
             # the sync-related code for Android has been upstreamed.
             # See http://crbug.com/159203
             '../third_party/cacheinvalidation/cacheinvalidation.gyp:cacheinvalidation_javalib',
           ],
+          'conditions': [
+            ['target_arch == "arm" or target_arch == "arm64"', {
+              'dependencies': [
+                # The relocation packer only works on ARM or ARM64.
+                '../tools/relocation_packer/relocation_packer.gyp:relocation_packer_unittests#host',
+              ],
+            }],
+          ],
         }, {
           'dependencies': [
             '../content/content_shell_and_tests.gyp:*',