| Index: tracing/tracing/ui/timeline_viewport.html
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| diff --git a/tracing/tracing/ui/timeline_viewport.html b/tracing/tracing/ui/timeline_viewport.html
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| index 61b4e3c3ec0242ad7d2f8e96fb4e1f79abd2f381..1230fd6511edb9227599c49dfba8f6fb013072ad 100644
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| --- a/tracing/tracing/ui/timeline_viewport.html
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| +++ b/tracing/tracing/ui/timeline_viewport.html
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| @@ -120,7 +120,7 @@ tr.exportTo('tr.ui', function() {
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|          this.iframe_ = document.createElement('iframe');
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|          this.iframe_.style.cssText =
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|              'position:absolute;width:100%;height:0;border:0;visibility:hidden;';
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| -        this.parentEl_.appendChild(this.iframe_);
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| +        Polymer.dom(this.parentEl_).appendChild(this.iframe_);
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|  
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|          this.iframe_.contentWindow.addEventListener('resize', this.onResize_);
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|        }
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| 
 |