android: Do not pass source_dir to package_apk.

build/java_apk.gypi

Index: build/java_apk.gypi
diff --git a/build/java_apk.gypi b/build/java_apk.gypi
index ed4f7143c68164efc7935b78359684dec64d7d1b..ccfd9afcb18ea71ba983f1ac04e8a63cf7d83f2c 100644
--- a/build/java_apk.gypi
+++ b/build/java_apk.gypi
@@ -108,7 +108,6 @@
     'unsigned_apk_path': '<(intermediate_dir)/<(apk_name)-unsigned.apk',
     'final_apk_path%': '<(PRODUCT_DIR)/apks/<(apk_name).apk',
     'incomplete_apk_path': '<(intermediate_dir)/<(apk_name)-incomplete.apk',
-    'source_dir': '<(java_in_dir)/src',
     'apk_install_record': '<(intermediate_dir)/apk_install.record.stamp',
     'device_intermediate_dir': '/data/local/tmp/chromium/<(_target_name)/<(CONFIGURATION_NAME)',
     'symlink_script_host_path': '<(intermediate_dir)/create_symlinks.sh',
@@ -757,7 +756,6 @@
         '-DCONFIGURATION_NAME=<(CONFIGURATION_NAME)',
         '-DNATIVE_LIBS_DIR=<(apk_package_native_libs_dir)',
         '-DOUT_DIR=<(intermediate_dir)',
-        '-DSOURCE_DIR=<(source_dir)',
         '-DUNSIGNED_APK_PATH=<(unsigned_apk_path)',
         '-DEMMA_INSTRUMENT=<(emma_instrument)',
         '-DEMMA_DEVICE_JAR=<(emma_device_jar)',