[iOS] Remove iOS9 ifdefs from FullscreenScrollEndAnimator.

Bug: none
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I5c19a4f3cdc8cdf00ade25bf76280fbb957f071d
Reviewed-on: https://chromium-review.googlesource.com/802622
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520984}

ios/chrome/browser/ui/fullscreen/fullscreen_scroll_end_animator.h

@@ -7,7 +7,6 @@
 
 #import <UIKit/UIKit.h>
 
-#if defined(__IPHONE_10_0) && (__IPHONE_OS_VERSION_MIN_ALLOWED >= __IPHONE_10_0)
 // When a scroll event ends, the toolbar should be either completely hidden or
 // completely visible.  If a scroll ends and the toolbar is partly visible, this
 // animator will be provided to UI elements to animate its state to a hidden or
@@ -29,17 +28,8 @@
 - (instancetype)initWithDuration:(NSTimeInterval)duration
                 timingParameters:(id<UITimingCurveProvider>)parameters
     NS_UNAVAILABLE;
+- (instancetype)init NS_UNAVAILABLE;
 
 @end
 
-#else
-
-// Dummy object.
-// TODO(crbug.com/768876): Remove this class and the #if guards once iOS9
-// support is dropped.
-@interface FullscreenScrollEndAnimator : NSObject
-@end
-
-#endif  // __IPHONE_10_0
-
 #endif  // IOS_CLEAN_CHROME_BROWSER_UI_FULLSCREEN_FULLSCREEN_SCROLL_END_ANIMATOR_H_

ios/chrome/browser/ui/fullscreen/fullscreen_scroll_end_animator.mm

@@ -16,7 +16,6 @@
 #error "This file requires ARC support."
 #endif
 
-#if defined(__IPHONE_10_0) && (__IPHONE_OS_VERSION_MIN_ALLOWED >= __IPHONE_10_0)
 @interface FullscreenScrollEndTimingCurveProvider
     : NSObject<UITimingCurveProvider> {
   std::unique_ptr<gfx::CubicBezier> _bezier;
@@ -114,10 +113,3 @@
 }
 
 @end
-
-#else
-
-@implementation FullscreenScrollEndAnimator
-@end
-
-#endif  // __IPHONE_10_0

ios/chrome/browser/ui/fullscreen/fullscreen_ui_updater_unittest.mm

@@ -80,8 +80,10 @@ TEST_F(FullscreenUIUpdaterTest, EnabledDisabled) {
 // Tests that the updater sends the animator to the UI element.
 TEST_F(FullscreenUIUpdaterTest, ScrollEnd) {
   ASSERT_FALSE(element().animator);
+  // Create a test animator.  The start progress of 0.0 is a dummy value, as the
+  // animator's progress properties are unused in this test.
   FullscreenScrollEndAnimator* const kAnimator =
-      [[FullscreenScrollEndAnimator alloc] init];
+      [[FullscreenScrollEndAnimator alloc] initWithStartProgress:0.0];
   observer()->FullscreenScrollEventEnded(nullptr, kAnimator);
   EXPECT_EQ(element().animator, kAnimator);
 }