Update android perf script

BUG=skia:

Review URL: https://codereview.chromium.org/1185293006
diff --git a/platform_tools/android/bin/android_perf b/platform_tools/android/bin/android_perf
index 7269082..3754013 100755
--- a/platform_tools/android/bin/android_perf
+++ b/platform_tools/android/bin/android_perf
@@ -41,7 +41,7 @@
 
     echo "Copying symbol files"
     adb_pull_if_needed /system/lib/libc.so $TMP_SYS_LIB
-    adb_pull_if_needed /system/lib/libc++.so $TMP_SYS_LIB
+    adb_pull_if_needed /system/lib/libstdc++.so $TMP_SYS_LIB
     adb_pull_if_needed /system/lib/libstlport.so $TMP_SYS_LIB
     adb_pull_if_needed /system/lib/libGLESv2.so $TMP_SYS_LIB
     adb_pull_if_needed /system/lib/libandroid.so $TMP_SYS_LIB