libwebp: update to 0.4.2-rc2

third_party/libwebp/README.chromium

Index: third_party/libwebp/README.chromium
diff --git a/third_party/libwebp/README.chromium b/third_party/libwebp/README.chromium
index abd53f56469a518b04d3aa55234d32fd0b294e36..993bf476a0eb372ad65a51bc25456a1b699afcfd 100644
--- a/third_party/libwebp/README.chromium
+++ b/third_party/libwebp/README.chromium
@@ -1,14 +1,14 @@
 Name: WebP image encoder/decoder
 Short Name: libwebp
 URL: http://developers.google.com/speed/webp
-Version: v0.4.1
+Version: v0.4.2-rc2
 License: BSD
 License File: LICENSE
 Security Critical: Yes
 
 Description:
 Source archive:
-  http://downloads.webmproject.org/releases/webp/libwebp-0.4.1.tar.gz
+  http://downloads.webmproject.org/releases/webp/libwebp-0.4.2-rc2.tar.gz
 
 WebP is an image format that does both lossy and lossless compression of
 digital photographic images. WebP consists of a codec based on VP8, that Google
@@ -20,10 +20,6 @@ Local changes:
  * Removed examples/, documentation and build related files, keeping only
    the contents of src/ less mux/ which is unused.
  * Merged COPYING/PATENTS to LICENSE
- * fcf7687 enc_mips32: workaround gcc-4.9 bug
-   (to be upstreamed if the problem persists in the final ndk r10 release)
 Cherry-picks:
   Revert patch f7fc4bc: dec/webp.c: don't wait for data before reporting w/h
-  0524d9e dsp: detect mips64 & disable mips32 code
-  b7e5a5c MIPS: detect mips32r6 and disable mips32r1 code
-  637b388 dsp/lossless: workaround gcc-4.9 bug on arm
+  e2ecae6 enc_mips32: workaround gcc-4.9 bug