Fix android build

build/all.gyp

Index: build/all.gyp
diff --git a/build/all.gyp b/build/all.gyp
index 0154569c771cbeb47ca2655cd2f3df63aabac696..89c1525cd22a4d20865514410ee12b18ff4aa56a 100644
--- a/build/all.gyp
+++ b/build/all.gyp
@@ -1200,17 +1200,20 @@
         },
       ],  # targets
     }, {
-      # TODO(thakis): Remove this once the linux gtk bot no longer references
-      # it (probably after the first aura release on linux), see r249162
-      'targets': [
-        {
-          'target_name': 'aura_builder',
-          'type': 'none',
-          'dependencies': [
-            '../chrome/chrome.gyp:chrome',
-          ],
-        },
-      ],  # targets
+      'conditions': [
+        ['OS=="linux"', {
+          # TODO(thakis): Remove this once the linux gtk bot no longer references
+          # it (probably after the first aura release on linux), see r249162
+          'targets': [
+            {
+              'target_name': 'aura_builder',
+              'type': 'none',
+              'dependencies': [
+                '../chrome/chrome.gyp:chrome',
+              ],
+            },
+          ],  # targets
+      }]], # OS=="linux"
     }], # "use_aura==1"
     ['test_isolation_mode != "noop"', {
       'targets': [