Replace private bridge categories with private header

Summary:
public

A lot of the core modules have to use private methods in the bridge, specially
since the `RCTBatchedBridge` interface is never exposed. That was leading to a
lot of different private bridge categories spread across different modules,
which makes harder to identify which modules are affected by private API changes.

Replace all the categories with a single private header.

Reviewed By: nicklockwood

Differential Revision: D2757564

fb-gh-sync-id: 793158b9082d542b74a6094ed0db4d5dc3a88f78

React/Modules/RCTDevMenu.m

@@ -10,7 +10,7 @@
 #import "RCTDevMenu.h"
 
 #import "RCTAssert.h"
-#import "RCTBridge.h"
+#import "RCTBridge+Private.h"
 #import "RCTDefines.h"
 #import "RCTEventDispatcher.h"
 #import "RCTKeyCommands.h"
@@ -22,13 +22,6 @@
 
 #if RCT_DEV
 
-@interface RCTBridge (Profiling)
-
-- (void)startProfiling;
-- (void)stopProfiling:(void (^)(NSData *))callback;
-
-@end
-
 static NSString *const RCTShowDevMenuNotification = @"RCTShowDevMenuNotification";
 static NSString *const RCTDevMenuSettingsKey = @"RCTDevMenu";
 

React/Modules/RCTTiming.m

@@ -11,18 +11,10 @@
 
 #import "RCTAssert.h"
 #import "RCTBridge.h"
+#import "RCTBridge+Private.h"
 #import "RCTLog.h"
 #import "RCTUtils.h"
 
-@interface RCTBridge (Private)
-
-/**
- * Allow super fast, one time, timers to skip the queue and be directly executed
- */
-- (void)_immediatelyCallTimer:(NSNumber *)timer;
-
-@end
-
 @interface RCTTimer : NSObject
 
 @property (nonatomic, strong, readonly) NSDate *target;