[ObjC ARC] Converts ios/chrome/common:common to ARC.

ios/chrome/common/material_timing.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/chrome/common/material_timing.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 UIViewAnimationOptions AnimationOptionsForceLinearTiming(
     UIViewAnimationOptions options) {
   // Remove any non-linear timing options from |options|. They should be
   // ignored.
   options &=
       ~(UIViewAnimationOptionCurveEaseInOut | UIViewAnimationOptionCurveEaseIn |
         UIViewAnimationOptionCurveEaseOut);
   // Since default is EaseInOut, ensure linear is specified instead so the outer
@@ skipping 15 matching lines @@
 const CGFloat kDuration1 = 0.25 * kSlowAnimationModifier;
 const CGFloat kDuration2 = 0.1 * kSlowAnimationModifier;
 const CGFloat kDuration3 = 0.35 * kSlowAnimationModifier;
 const CGFloat kDuration4 = 0.05 * kSlowAnimationModifier;
 const CGFloat kDuration5 = 0.5 * kSlowAnimationModifier;
 const CGFloat kDuration6 = 0.15 * kSlowAnimationModifier;
 const CGFloat kDuration7 = 0.4 * kSlowAnimationModifier;
 const CGFloat kDuration8 = 0.07 * kSlowAnimationModifier;
 
 CAMediaTimingFunction* TransformCurve2() {
-  return [[[CAMediaTimingFunction alloc]
-      initWithControlPoints:0.0f :0.84f :0.13f :0.99f] autorelease];
+  return [[CAMediaTimingFunction alloc] initWithControlPoints:
+                                                         0.0f:
+                                                        0.84f:
+                                                        0.13f:0.99f];

[pkl (ping after 24h if needed), 2017/02/09 16:46:37]

Is this what git-cl-format did? This looks less readable when the : is placed
after each parameter. I can't find any style guide recommendation on this.

[lody, 2017/02/09 16:51:50]

Yeah, I just tried to make sure and it is git cl format doing that. Totally
agree that this looks awful. I think it's confused by the lack of argument names
(so am I ;) ).

 }
 
 CAMediaTimingFunction* TimingFunction(Curve curve) {
   switch (curve) {
     case CurveEaseInOut:
       // This curve is slow both at the begining and end.
       // Visualization of curve  http://cubic-bezier.com/#.4,0,.2,1
-      return [[[CAMediaTimingFunction alloc]
-          initWithControlPoints:0.4f :0.0f :0.2f :1.0f] autorelease];
+      return [[CAMediaTimingFunction alloc] initWithControlPoints:
+                                                             0.4f:
+                                                             0.0f:
+                                                             0.2f:1.0f];
     case CurveEaseOut:
       // This curve is slow at the end.
       // Visualization of curve  http://cubic-bezier.com/#0,0,.2,1
-      return [[[CAMediaTimingFunction alloc]
-          initWithControlPoints:0.0f :0.0f :0.2f :1.0f] autorelease];
+      return [[CAMediaTimingFunction alloc] initWithControlPoints:
+                                                             0.0f:
+                                                             0.0f:
+                                                             0.2f:1.0f];
     case CurveEaseIn:
       // This curve is slow at the begining.
       // Visualization of curve  http://cubic-bezier.com/#.4,0,1,1
-      return [[[CAMediaTimingFunction alloc]
-          initWithControlPoints:0.4f :0.0f :1.0f :1.0f] autorelease];
+      return [[CAMediaTimingFunction alloc] initWithControlPoints:
+                                                             0.4f:
+                                                             0.0f:
+                                                             1.0f:1.0f];
     case CurveLinear:
       // This curve is linear.
       return
           [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
   }
 }
 
 }  // material
 }  // ios
 
@@ skipping 25 matching lines @@
   [CATransaction setAnimationTimingFunction:TimingFunction(curve)];
   [UIView transitionWithView:view
                     duration:duration
                      options:AnimationOptionsForceLinearTiming(options)
                   animations:animations
                   completion:completion];
   [CATransaction commit];
 }
 
 @end