libwebp: update snapshot to v0.3.0-rc6

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 dd1e646162a938d19228a856ebca8d9ae0141060..83a6a171c8997832c7e3cf9946d04b106e6b6954 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: v0.2.0-rc1
+Version: v0.3.0-rc6
 License: BSD
 License File: LICENSE
 Security Critical: Yes
 
 Description:
 Source archive:
-  http://code.google.com/p/webp/downloads/detail?name=libwebp-0.2.0-rc1.tar.gz
+  http://code.google.com/p/webp/downloads/detail?name=libwebp-0.3.0-rc6.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
@@ -20,12 +20,3 @@ 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
- * Revert VP8 encoder changes to avoid WebKit layout test conflicts
-   (fast/canvas/canvas-toDataURL)
-   WebKit bug tracking test update:
-     https://bugs.webkit.org/show_bug.cgi?id=93310
-   Changes reverted:
-     0de3096 use 16bit counters for recording proba counts
-     7f23678 fix for LevelCost + little speed-up
-     7107d54 further speed-up/cleanup of RecordCoeffs() and GetResidualCost()
- * (Security) fix overflow in ParseOptionalChunks; to be upstreamed.