Remove java.io.tmpdir assignment in AndroidRuntime.

This value is overridden by the framework anyway
(see ActivityThread.handleBindApplication). Besides,
it doesn't seem like a great idea to let tools clutter
/sdcard/ with temp files.

Change-Id: I26c710cbea7397f89e6103e54a73044a87da95b1
diff --git a/core/jni/AndroidRuntime.cpp b/core/jni/AndroidRuntime.cpp
index 97ea5e6..b4599b6 100644
--- a/core/jni/AndroidRuntime.cpp
+++ b/core/jni/AndroidRuntime.cpp
@@ -760,13 +760,6 @@
         mOptions.add(opt);
     }
 
-    /*
-     * We don't have /tmp on the device, but we often have an SD card.  Apps
-     * shouldn't use this, but some test suites might want to exercise it.
-     */
-    opt.optionString = "-Djava.io.tmpdir=/sdcard";
-    mOptions.add(opt);
-
     initArgs.version = JNI_VERSION_1_4;
     initArgs.options = mOptions.editArray();
     initArgs.nOptions = mOptions.size();