Make FSTTimestamp into a public Firestore class (#698)

- FSTTimestamp is now FIRTimestamp, under Firestore/Source/{Public,API}. This is a temporary solution; eventually, FIRTimestamp is supposed to live somewhere under Firebase;
- move most internal Timestamp methods to the public header (the only exception is ISOString).

1 files changed, 1 insertions, 1 deletions

diff --git a/Firestore/Source/Local/FSTMemoryMutationQueue.mm b/Firestore/Source/Local/FSTMemoryMutationQueue.mm
index 702f614..2a6a1cc 100644
--- a/Firestore/Source/Local/FSTMemoryMutationQueue.mm
+++ b/Firestore/Source/Local/FSTMemoryMutationQueue.mm
@@ -139,7 +139,7 @@ static const NSComparator NumberComparator = ^NSComparisonResult(NSNumber *left,
   self.lastStreamToken = streamToken;
 }
 
-- (FSTMutationBatch *)addMutationBatchWithWriteTime:(FSTTimestamp *)localWriteTime
+- (FSTMutationBatch *)addMutationBatchWithWriteTime:(FIRTimestamp *)localWriteTime
                                           mutations:(NSArray<FSTMutation *> *)mutations
                                               group:(FSTWriteGroup *)group {
   FSTAssert(mutations.count > 0, @"Mutation batches should not be empty");