Update third_party/protobuf to protobuf-v3.0.0-beta-3

third_party/protobuf/java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java

Index: third_party/protobuf/java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
diff --git a/third_party/protobuf/java/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
similarity index 92%
rename from third_party/protobuf/java/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
rename to third_party/protobuf/java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
index 0a76105278fba5d2a2127117c99e36846017d659..85ce7b24ac8a116f876a0cd274368b40219c2a3a 100644
--- a/third_party/protobuf/java/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
+++ b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/InvalidProtocolBufferException.java
@@ -46,6 +46,10 @@ public class InvalidProtocolBufferException extends IOException {
     super(description);
   }
 
+  public InvalidProtocolBufferException(IOException e) {
+    super(e.getMessage(), e);
+  }
+
   /**
    * Attaches an unfinished message to the exception to support best-effort
    * parsing in {@code Parser} interface.
@@ -66,6 +70,14 @@ public class InvalidProtocolBufferException extends IOException {
     return unfinishedMessage;
   }
 
+  /**
+   * Unwraps the underlying {@link IOException} if this exception was caused by an I/O
+   * problem. Otherwise, returns {@code this}.
+   */
+  public IOException unwrapIOException() {
+    return getCause() instanceof IOException ? (IOException) getCause() : this;
+  }
+
   static InvalidProtocolBufferException truncatedMessage() {
     return new InvalidProtocolBufferException(
       "While parsing a protocol message, the input ended unexpectedly " +