Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

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

Index: third_party/protobuf/java/core/src/main/java/com/google/protobuf/Internal.java
diff --git a/third_party/protobuf/java/core/src/main/java/com/google/protobuf/Internal.java b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/Internal.java
index c234559ce3834f7b3ead8cf85839dc8bdbbb1c17..d1de375e146f07061bd4a5a56fe6cc4f43f3d15f 100644
--- a/third_party/protobuf/java/core/src/main/java/com/google/protobuf/Internal.java
+++ b/third_party/protobuf/java/core/src/main/java/com/google/protobuf/Internal.java
@@ -60,16 +60,6 @@ public final class Internal {
   static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
 
   /**
-   * Throws an appropriate {@link NullPointerException} if the given objects is {@code null}.
-   */
-  static <T> T checkNotNull(T obj, String message) {
-    if (obj == null) {
-      throw new NullPointerException(message);
-    }
-    return obj;
-  }
-
-  /**
    * Helper called by generated code to construct default values for string
    * fields.
    * <p>
@@ -621,12 +611,12 @@ public final class Internal {
     int getInt(int index);
 
     /**
-     * Like {@link #add(Object)} but more efficient in that it doesn't box the element.
+     * Like {@link #add(Integer)} but more efficient in that it doesn't box the element.
      */
     void addInt(int element);
 
     /**
-     * Like {@link #set(int, Object)} but more efficient in that it doesn't box the element.
+     * Like {@link #set(int, Integer)} but more efficient in that it doesn't box the element.
      */
     int setInt(int index, int element);
 
@@ -649,12 +639,12 @@ public final class Internal {
     boolean getBoolean(int index);
 
     /**
-     * Like {@link #add(Object)} but more efficient in that it doesn't box the element.
+     * Like {@link #add(Boolean)} but more efficient in that it doesn't box the element.
      */
     void addBoolean(boolean element);
 
     /**
-     * Like {@link #set(int, Object)} but more efficient in that it doesn't box the element.
+     * Like {@link #set(int, Boolean)} but more efficient in that it doesn't box the element.
      */
     boolean setBoolean(int index, boolean element);
 
@@ -677,12 +667,12 @@ public final class Internal {
     long getLong(int index);
 
     /**
-     * Like {@link #add(Object)} but more efficient in that it doesn't box the element.
+     * Like {@link #add(Long)} but more efficient in that it doesn't box the element.
      */
     void addLong(long element);
 
     /**
-     * Like {@link #set(int, Object)} but more efficient in that it doesn't box the element.
+     * Like {@link #set(int, Long)} but more efficient in that it doesn't box the element.
      */
     long setLong(int index, long element);
 
@@ -705,12 +695,12 @@ public final class Internal {
     double getDouble(int index);
 
     /**
-     * Like {@link #add(Object)} but more efficient in that it doesn't box the element.
+     * Like {@link #add(Double)} but more efficient in that it doesn't box the element.
      */
     void addDouble(double element);
 
     /**
-     * Like {@link #set(int, Object)} but more efficient in that it doesn't box the element.
+     * Like {@link #set(int, Double)} but more efficient in that it doesn't box the element.
      */
     double setDouble(int index, double element);
 
@@ -733,12 +723,12 @@ public final class Internal {
     float getFloat(int index);
 
     /**
-     * Like {@link #add(Object)} but more efficient in that it doesn't box the element.
+     * Like {@link #add(Float)} but more efficient in that it doesn't box the element.
      */
     void addFloat(float element);
 
     /**
-     * Like {@link #set(int, Object)} but more efficient in that it doesn't box the element.
+     * Like {@link #set(int, Float)} but more efficient in that it doesn't box the element.
      */
     float setFloat(int index, float element);