[dmprof] Fix prepare_symbol_info.py for Android

Use binary_path (which is mapped from target->host executable on Android)
instead of entry.name when generating file hash.

BUG=

Review URL: https://chromiumcodereview.appspot.com/18996002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@210864 0039d316-1c4b-4281-b951-d872f2087c98

tools/find_runtime_symbols/prepare_symbol_info.py

@@ -176,9 +176,9 @@ def prepare_symbol_info(maps_path,
       files[entry.name]['readelf-debug-decodedline-file'] = {
           'file': os.path.basename(readelf_debug_decodedline_file)}
 
-    files[entry.name]['size'] = os.stat(entry.name).st_size
+    files[entry.name]['size'] = os.stat(binary_path).st_size
 
-    with open(entry.name, 'rb') as entry_f:
+    with open(binary_path, 'rb') as entry_f:
       md5 = hashlib.md5()
       sha1 = hashlib.sha1()
       chunk = entry_f.read(1024 * 1024)