Revert of Changed Blimp client to start with white screen before drawing contents

Revert of Changed Blimp client to start with white screen before drawing contents (patchset #4 id:60001 of https://codereview.chromium.org/1925863003/ )

Reason for revert:
Reverting because this patch broke the Dr Memory bot:

https://build.chromium.org/p/chromium.memory.fyi/builders/Windows%20Unit%20%28DrMemory%29/builds/4772

Original issue's description:
> Changed Blimp client to start with white screen before drawing contents
> 
> Currently Blimp client starts with a black screen before having any
> contents. In this patch, this behavior was fixed by two steps:
> 1 - BlimpView background color is set to white on initialization.
> 2 - Later after the first frame is received, the background is reset to
> null.
> For this to happen, we rely on the callback DidCompleteSwapBuffers of
> RemoteChannelImpl and hook it all the way to BlimpView.
> 
> BUG=603797
> CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
> 
> Committed: https://crrev.com/a14676fc06d51ce9382217801882dae19e2c792a
> Cr-Commit-Position: refs/heads/master@{#391619}

TBR=khushalsagar@chromium.org,nyquist@chromium.org,vmpstr@chromium.org,shaktisahu@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=603797

[tommycli, 2016-05-10 17:02:55]

Created Revert of Changed Blimp client to start with white screen before drawing
contents

[commit-bot: I haz the power, 2016-05-10 17:03:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1965843002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1965843002/1

[commit-bot: I haz the power, 2016-05-10 17:06:38]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-05-10 17:06:40]

Try jobs failed on following builders:
  ios-device on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device/builds...)
  ios-device-gn on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-device-gn/bui...)
  ios-simulator on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios-simulator/bui...)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)