Convert Pass()→std::move() for iOS build.

ios/web/web_state/ui/crw_web_controller.mm

Index: ios/web/web_state/ui/crw_web_controller.mm
diff --git a/ios/web/web_state/ui/crw_web_controller.mm b/ios/web/web_state/ui/crw_web_controller.mm
index 52cb0605586a313b0bdc1adcecc8bac85c32af97..c86d6db5fc92cf74d9e9e9bb2829adb97a25e1f4 100644
--- a/ios/web/web_state/ui/crw_web_controller.mm
+++ b/ios/web/web_state/ui/crw_web_controller.mm
@@ -6,7 +6,9 @@
 
 #import <objc/runtime.h>
 #include <stddef.h>
+
 #include <cmath>
+#include <utility>
 
 #include "base/ios/block_types.h"
 #import "base/ios/ns_error_util.h"
@@ -585,7 +587,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
 - (instancetype)initWithWebState:(scoped_ptr<WebStateImpl>)webState {
   self = [super init];
   if (self) {
-    _webStateImpl = webState.Pass();
+    _webStateImpl = std::move(webState);
     DCHECK(_webStateImpl);
     _webStateImpl->SetWebController(self);
     _webStateImpl->InitializeRequestTracker(self);
@@ -894,7 +896,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
 }
 
 - (void)setDOMElementForLastTouch:(scoped_ptr<base::DictionaryValue>)element {
-  _DOMElementForLastTouch = element.Pass();
+  _DOMElementForLastTouch = std::move(element);
 }
 
 - (void)showContextMenu:(UIGestureRecognizer*)gestureRecognizer {
@@ -1876,7 +1878,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
          if (handler) {
            scoped_ptr<base::Value> result(
                base::JSONReader::Read(base::SysNSStringToUTF8(stringResult)));
-           handler(result.Pass(), error);
+           handler(std::move(result), error);
          }
        }];
 }
@@ -2986,7 +2988,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
   base::WeakNSObject<CRWWebController> weakSelf(self);
   [self fetchDOMElementAtPoint:[touch locationInView:self.webView]
              completionHandler:^(scoped_ptr<base::DictionaryValue> element) {
-               [weakSelf setDOMElementForLastTouch:element.Pass()];
+               [weakSelf setDOMElementForLastTouch:std::move(element)];
              }];
   return YES;
 }
@@ -3576,7 +3578,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
                    // |element| scoped_ptr.
                    elementAsDict.reset(elementAsDictPtr);
                  }
-                 handler(elementAsDict.Pass());
+                 handler(std::move(elementAsDict));
                }];
   }];
 }