Update two WebGL 1.0 links that weren't to /latest/

BUG=673852
NOTRY=true

Review-Url: https://codereview.chromium.org/2579313002
Cr-Commit-Position: refs/heads/master@{#439095}

third_party/WebKit/Source/modules/webgl/WebGLContextEvent.idl

@@ -23,7 +23,7 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-// https://www.khronos.org/registry/webgl/specs/1.0/#5.15
+// https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15
 
 [
     Constructor(DOMString type, optional WebGLContextEventInit eventInit),

third_party/WebKit/Source/modules/webgl/WebGLContextEventInit.idl

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// https://www.khronos.org/registry/webgl/specs/1.0/#5.15
+// https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.15
 
 dictionary WebGLContextEventInit : EventInit {
     DOMString statusMessage;