[Android] Roll android_tools to Android M SDK.

build/secondary/third_party/android_tools/BUILD.gn

Index: build/secondary/third_party/android_tools/BUILD.gn
diff --git a/build/secondary/third_party/android_tools/BUILD.gn b/build/secondary/third_party/android_tools/BUILD.gn
index 06503b3c4afee1693c5cf9c9886cf591240a7533..b2fdb88042da4f74241354f76ccc010a0bf92669 100644
--- a/build/secondary/third_party/android_tools/BUILD.gn
+++ b/build/secondary/third_party/android_tools/BUILD.gn
@@ -142,3 +142,8 @@ action("check_sdk_extras_version") {
     "$target_gen_dir/checked_sdk_extras_version.stamp",
   ]
 }
+
+# TODO(jbudorick): Remove this once net_java_test_support no longer needs it.
+android_java_prebuilt("legacy_http_javalib") {
+  jar_path = "$android_sdk/optional/org.apache.http.legacy.jar"
+}