Update all usages of PFFile.isDirty to use properties.

Author: nlutsenko

Parse/Internal/PFEncoder.m

@@ -47,7 +47,7 @@ - (id)encodeObject:(id)object {
                  };
 
     } else if ([object isKindOfClass:[PFFile class]]) {
-        if (((PFFile *)object).isDirty) {
+        if (((PFFile *)object).dirty) {
             // TODO: (nlutsenko) Figure out what to do with things like an unsaved file
             // in a mutable container, where we don't normally want to allow serializing
             // such a thing inside an object.

Tests/Unit/FileUnitTests.m

@@ -140,28 +140,28 @@ - (void)testContructors {
     PFFile *file = [PFFile fileWithData:[NSData data]];
     XCTAssertEqualObjects(file.name, @"file");
     XCTAssertNil(file.url);
-    XCTAssertTrue(file.isDirty);
+    XCTAssertTrue(file.dirty);
     XCTAssertTrue(file.isDataAvailable);
 
     [self clearStagingAndTemporaryFiles];
     file = [PFFile fileWithData:[NSData data] contentType:@"content-type"];
     XCTAssertEqualObjects(file.name, @"file");
     XCTAssertNil(file.url);
-    XCTAssertTrue(file.isDirty);
+    XCTAssertTrue(file.dirty);
     XCTAssertTrue(file.isDataAvailable);
 
     [self clearStagingAndTemporaryFiles];
     file = [PFFile fileWithName:@"name" data:[NSData data]];
     XCTAssertEqualObjects(file.name, @"name");
     XCTAssertNil(file.url);
-    XCTAssertTrue(file.isDirty);
+    XCTAssertTrue(file.dirty);
     XCTAssertTrue(file.isDataAvailable);
 
     [self clearStagingAndTemporaryFiles];
     file = [PFFile fileWithName:nil contentsAtPath:[self sampleFilePath]];
     XCTAssertEqualObjects(file.name, @"file");
     XCTAssertNil(file.url);
-    XCTAssertTrue(file.isDirty);
+    XCTAssertTrue(file.dirty);
     XCTAssertTrue(file.isDataAvailable);
 
     [self clearStagingAndTemporaryFiles];
@@ -170,22 +170,22 @@ - (void)testContructors {
     XCTAssertNil(error);
     XCTAssertEqualObjects(file.name, @"file");
     XCTAssertNil(file.url);
-    XCTAssertTrue(file.isDirty);
+    XCTAssertTrue(file.dirty);
     XCTAssertTrue(file.isDataAvailable);
 
     [self clearStagingAndTemporaryFiles];
     file = [PFFile fileWithName:nil data:[NSData data] contentType:@"content-type"];
     XCTAssertEqualObjects(file.name, @"file");
     XCTAssertNil(file.url);
-    XCTAssertTrue(file.isDirty);
+    XCTAssertTrue(file.dirty);
     XCTAssertTrue(file.isDataAvailable);
 
     [self clearStagingAndTemporaryFiles];
     file = [PFFile fileWithName:nil data:[NSData data] contentType:@"content-type" error:&error];
     XCTAssertNil(error);
     XCTAssertEqualObjects(file.name, @"file");
     XCTAssertNil(file.url);
-    XCTAssertTrue(file.isDirty);
+    XCTAssertTrue(file.dirty);
     XCTAssertTrue(file.isDataAvailable);
 }