Removes canHandleURL from FIRAuthInternal (#235)

* Removes canHandleURL from FIRAuthInternal

Removes canHandleURL from FIRAuth_Internal and makes small modification to FIRPhoneAuthProvider unit test.

* Addresses comment

Author: protocol86

Example/Auth/Tests/FIRPhoneAuthProviderTests.m

@@ -314,7 +314,10 @@ - (void)testVerifyPhoneNumberUIDelegate {
       NSMutableString *fakeRedirectURLString =
           [NSMutableString stringWithString:kFakeRedirectURLStringWithoutReCAPTCHAToken];
       [fakeRedirectURLString appendString:kFakeReCAPTCHAToken];
-      [[_mockAuth authURLPresenter] canHandleURL:[NSURL URLWithString:fakeRedirectURLString]];
+      OCMExpect([_mockAuth canHandleURL:OCMOCK_ANY]).andDo(^(NSInvocation *invocation) {
+        [[_mockAuth authURLPresenter] canHandleURL:[NSURL URLWithString:fakeRedirectURLString]];
+      });
+      [_mockAuth canHandleURL:[NSURL URLWithString:fakeRedirectURLString]];
     });
     // Expect view controller dismissal by UIDelegate.
     OCMExpect([mockUIDelegate dismissViewControllerAnimated:OCMOCK_ANY completion:OCMOCK_ANY]).

Firebase/Auth/Source/FIRAuth_Internal.h

@@ -124,18 +124,6 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (BOOL)signOutByForceWithUserID:(NSString *)userID error:(NSError *_Nullable *_Nullable)error;
 
-/** @fn canHandleURL:
-    @brief Whether the specific URL is handled by @c FIRAuth .
-    @param url The URL received by the application delegate from any of the openURL method.
-    @return Whether or the URL is handled. YES means the URL is for Firebase Auth
-        so the caller should ignore the URL from further processing, and NO means the
-        the URL is for the app (or another libaray) so the caller should continue handling
-        this URL as usual.
-    @remarks If swizzling is disabled, URLs received by the application delegate must be forwarded
-        to this method for phone number auth to work.
- */
-- (BOOL)canHandleURL:(nonnull NSURL *)url;
-
 @end
 
 NS_ASSUME_NONNULL_END