Don't show media controls download button on local files.

third_party/WebKit/LayoutTests/platform/linux/media/video-zoom-controls-expected.txt

Index: third_party/WebKit/LayoutTests/platform/linux/media/video-zoom-controls-expected.txt
diff --git a/third_party/WebKit/LayoutTests/platform/linux/media/video-zoom-controls-expected.txt b/third_party/WebKit/LayoutTests/platform/linux/media/video-zoom-controls-expected.txt
index 04627d285ad5e6c3dc54d875647abc4d730b4fbf..929ac753e8394678975e26c86bf762622fcae569 100644
--- a/third_party/WebKit/LayoutTests/platform/linux/media/video-zoom-controls-expected.txt
+++ b/third_party/WebKit/LayoutTests/platform/linux/media/video-zoom-controls-expected.txt
@@ -13,7 +13,7 @@ layer at (57,85) size 240x180
     LayoutBlockFlow {DIV} at (0,132) size 240x48
 layer at (57,85) size 240x117
   LayoutFlexibleBox (relative positioned) {DIV} at (0,0) size 240x117
-layer at (57,217) size 240x48 scrollWidth 284 scrollHeight 60
+layer at (57,217) size 240x48 scrollWidth 327 scrollHeight 60
   LayoutFlexibleBox (relative positioned) {DIV} at (0,0) size 240x48 [bgcolor=#FAFAFA]
     LayoutButton {INPUT} at (0,0) size 48x48
     LayoutSlider {INPUT} at (75,22.50) size 37.50x3
@@ -21,9 +21,12 @@ layer at (57,217) size 240x48 scrollWidth 284 scrollHeight 60
         LayoutBlockFlow {DIV} at (-27,-34.50) size 91.50x72
           LayoutBlockFlow {DIV} at (0,0) size 54x72
     LayoutButton {INPUT} at (139.50,0) size 48x48
-    LayoutButton {INPUT} at (235.50,0) size 48x48
-layer at (245,217) size 48x48
-  LayoutButton {INPUT} at (187.50,0) size 48x48
+    LayoutSlider {INPUT} at (214.50,22.50) size 37.50x3
+      LayoutFlexibleBox {DIV} at (0,0) size 37.50x3
+        LayoutBlockFlow {DIV} at (-27,-34.50) size 91.50x72
+          LayoutBlockFlow {DIV} at (37.50,0) size 54x72
+layer at (336,217) size 48x48 backgroundClip at (0,0) size 0x0 clip at (0,0) size 0x0
+  LayoutButton {INPUT} at (279,0) size 48x48
 layer at (57,310) size 240x180
   LayoutVideo {VIDEO} at (45,298) size 240x180
 layer at (57,310) size 240x180
@@ -31,7 +34,7 @@ layer at (57,310) size 240x180
     LayoutBlockFlow {DIV} at (0,132) size 240x48
 layer at (57,310) size 240x117
   LayoutFlexibleBox (relative positioned) {DIV} at (0,0) size 240x117
-layer at (57,442) size 240x48 scrollWidth 284 scrollHeight 60
+layer at (57,442) size 240x48 scrollWidth 327 scrollHeight 60
   LayoutFlexibleBox (relative positioned) {DIV} at (0,0) size 240x48 [bgcolor=#FAFAFA]
     LayoutButton {INPUT} at (0,0) size 48x48
     LayoutSlider {INPUT} at (75,22.50) size 37.50x3
@@ -39,6 +42,9 @@ layer at (57,442) size 240x48 scrollWidth 284 scrollHeight 60
         LayoutBlockFlow {DIV} at (-27,-34.50) size 91.50x72
           LayoutBlockFlow {DIV} at (0,0) size 54x72
     LayoutButton {INPUT} at (139.50,0) size 48x48
-    LayoutButton {INPUT} at (235.50,0) size 48x48
-layer at (245,442) size 48x48 backgroundClip at (245,442) size 47x27 clip at (245,442) size 47x27
-  LayoutButton {INPUT} at (187.50,0) size 48x48
+    LayoutSlider {INPUT} at (214.50,22.50) size 37.50x3
+      LayoutFlexibleBox {DIV} at (0,0) size 37.50x3
+        LayoutBlockFlow {DIV} at (-27,-34.50) size 91.50x72
+          LayoutBlockFlow {DIV} at (37.50,0) size 54x72
+layer at (336,442) size 48x48 backgroundClip at (0,0) size 0x0 clip at (0,0) size 0x0
+  LayoutButton {INPUT} at (279,0) size 48x48