Revert "Enable the clang style plugin in rtc_base/"

This reverts commit af551a1956d2ec3a388cf7e0e88c7ee2c2b61291.

Reason for revert: Fails to compile on Chromium FYI bot: https://build.chromium.org/p/chromium.webrtc.fyi/builders/Linux%20Builder/builds/21375

Original change's description:
> Enable the clang style plugin in rtc_base/
> 
> Enabled the plugin and cleaned up all issues it found.
> 
> Bug: webrtc:163
> Change-Id: Id63f0deb7b335690157ab157c35177b7836688da
> Reviewed-on: https://webrtc-review.googlesource.com/14660
> Commit-Queue: Steve Anton <steveanton@webrtc.org>
> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#20401}

TBR=steveanton@webrtc.org,kwiberg@webrtc.org

Change-Id: Iafdf4bc1744a981b5d7d38e4a0c5b2d88753f00a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:163
Reviewed-on: https://webrtc-review.googlesource.com/14740
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20402}

rtc_base/proxy_unittest.cc

@@ -37,6 +37,7 @@ class ProxyTest : public testing::Test {
     https_.reset(new rtc::HttpListenServer());
     https_->Listen(kHttpsProxyIntAddr);
   }
+  ~ProxyTest() {}
 
   rtc::SocketServer* ss() { return ss_.get(); }