Integer.MAX_SIZE (0x7FFFFFF) #2228

M java/core/src/main/java/com/google/protobuf/CodedInputStream.java
 Set DEFAULT_SIZE_LIMIT to Integer.MAX_SIZE (Was 64MB). This is how it was
 in pre-2.7.0 pb. Changed size check to an overflow-conscious test (as it
 is later in tryRefillBuffer (making sizeLimit a long was to disruptive).

M java/core/src/test/java/com/google/protobuf/CodedInputStreamTest.java
 Add two tests that echo tests recently added over in c++ to test parse
 of message sizes that are approach and are beyond the size limit.