Revert of Make ui/gl depend on the necessary runtime targets on Windows....

Revert of Make ui/gl depend on the necessary runtime targets on Windows. (patchset #3 id:40001 of https://codereview.chromium.org/1070933002/)

Reason for revert:
This CL introduces a typo to the GN build file, so that Windows GN builds fail.

It should be possible to reland after below line is changed from appending to assignment.

ERROR at //ui/gl/BUILD.gn:203:5: Undefined variable for +=.
    data_deps += [
    ^--------
I don't have something with this name in scope now.

See: http://build.chromium.org/p/chromium.win/builders/Win8%20GN

Original issue's description:
> Make ui/gl depend on the necessary runtime targets on Windows.
>
> Committed: https://crrev.com/f4a6e44ff20c29a6410a698a06a45dd11666ef53
> Cr-Commit-Position: refs/heads/master@{#324320}

TBR=brettw@chromium.org,scottmg@chromium.org,jam@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1071113002

Cr-Commit-Position: refs/heads/master@{#324404}

gpu/BUILD.gn

@@ -129,6 +129,14 @@ test("gl_tests") {
     deps += [ "//testing/android:native_test_native_code" ]
     libs += [ "android" ]
   }
+
+  # TODO(GYP)
+  #     ['OS == "win"', {
+  #       'dependencies': [
+  #         '../third_party/angle/src/build_angle.gyp:libEGL',
+  #         '../third_party/angle/src/build_angle.gyp:libGLESv2',
+  #       ],
+  #     }],
 }
 
 test("gpu_unittests") {

ui/gl/BUILD.gn

@@ -199,12 +199,6 @@ component("gl") {
 
     libs = [ "dwmapi.lib" ]
     ldflags = [ "/DELAYLOAD:dwmapi.dll" ]
-
-    data_deps += [
-      "//third_party/angle:libEGL",
-      "//third_party/angle:libGLESv2",
-      "//third_party/mesa:osmesa",
-    ]
   }
   if (is_mac) {
     sources += [