[ObjC ARC] Converts ios/chrome/app/safe_mode:safe_mode to ARC.

ios/chrome/app/safe_mode/safe_mode_view_controller.mm

Index: ios/chrome/app/safe_mode/safe_mode_view_controller.mm
diff --git a/ios/chrome/app/safe_mode/safe_mode_view_controller.mm b/ios/chrome/app/safe_mode/safe_mode_view_controller.mm
index fbd921c49e2c743ed3cfe2dd7b2fa3e18de9bb27..5a3eb5a229b14c9429374207f125460d1b6679c4 100644
--- a/ios/chrome/app/safe_mode/safe_mode_view_controller.mm
+++ b/ios/chrome/app/safe_mode/safe_mode_view_controller.mm
@@ -16,6 +16,10 @@
 #include "ios/chrome/grit/ios_chromium_strings.h"
 #import "ui/gfx/ios/NSString+CrStringDrawing.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 const CGFloat kVerticalSpacing = 20;
 const CGFloat kUploadProgressSpacing = 5;
@@ -139,8 +143,7 @@ const NSTimeInterval kUploadTotalTime = 5;
   if (IsLandscape()) {
     mainBounds.size = CGSizeMake(mainBounds.size.height, mainBounds.size.width);
   }
-  base::scoped_nsobject<UIScrollView> scrollView(
-      [[UIScrollView alloc] initWithFrame:mainBounds]);
+  UIScrollView* scrollView = [[UIScrollView alloc] initWithFrame:mainBounds];
   self.view = scrollView;
   [self.view setBackgroundColor:[UIColor colorWithWhite:0.902 alpha:1.0]];
   const CGFloat kIPadInset =
@@ -157,8 +160,7 @@ const NSTimeInterval kUploadTotalTime = 5;
   [scrollView addSubview:innerView_];
 
   UIImage* fatalImage = [UIImage imageNamed:@"fatal_error.png"];
-  base::scoped_nsobject<UIImageView> imageView(
-      [[UIImageView alloc] initWithImage:fatalImage]);
+  UIImageView* imageView = [[UIImageView alloc] initWithImage:fatalImage];
   // Shift the image down a bit.
   CGRect imageFrame = [imageView frame];
   imageFrame.origin.y = kVerticalSpacing;
@@ -166,7 +168,7 @@ const NSTimeInterval kUploadTotalTime = 5;
   [self centerView:imageView afterView:nil];
   [innerView_ addSubview:imageView];
 
-  base::scoped_nsobject<UILabel> awSnap([[UILabel alloc] init]);
+  UILabel* awSnap = [[UILabel alloc] init];
   [awSnap setText:NSLocalizedString(@"IDS_IOS_SAFE_MODE_AW_SNAP", @"")];
   [awSnap setBackgroundColor:[UIColor clearColor]];
   [awSnap setTextColor:[UIColor blackColor]];
@@ -175,7 +177,7 @@ const NSTimeInterval kUploadTotalTime = 5;
   [self centerView:awSnap afterView:imageView];
   [innerView_ addSubview:awSnap];
 
-  base::scoped_nsobject<UILabel> description([[UILabel alloc] init]);
+  UILabel* description = [[UILabel alloc] init];
   [description setText:[self startupCrashModuleText]];
   [description setBackgroundColor:[UIColor clearColor]];
   [description setTextColor:[UIColor colorWithWhite:0.31 alpha:1.0]];
@@ -265,13 +267,13 @@ const NSTimeInterval kUploadTotalTime = 5;
 #pragma mark - Private
 
 - (void)startUploadProgress {
-  uploadStartTime_.reset([[NSDate date] retain]);
-  uploadTimer_.reset(
-      [[NSTimer scheduledTimerWithTimeInterval:kUploadPumpInterval
-                                        target:self
-                                      selector:@selector(pumpUploadProgress)
-                                      userInfo:nil
-                                       repeats:YES] retain]);
+  uploadStartTime_.reset([NSDate date]);
+  uploadTimer_.reset([NSTimer
+      scheduledTimerWithTimeInterval:kUploadPumpInterval
+                              target:self
+                            selector:@selector(pumpUploadProgress)
+                            userInfo:nil
+                             repeats:YES]);
 }
 
 - (void)pumpUploadProgress {