Revert of Modify profiles for H264 encode SW fallback (patchset #2 id:20001 of https://codereview.webrtc.org/2997913003/ )

Reason for revert:
Breaks the internal bots.
Root cause: The "public_deps" is defined behind an "if" condition which may not be true.

Original issue's description:
> Modify profiles for H264 encode SW fallback
>
> We have only Constrained Baseline profile available in SW encoder impl
> so modify the profile to that in case  of a fallback
>
> BUG=chromium:735959
>
> Review-Url: https://codereview.webrtc.org/2997913003
> Cr-Commit-Position: refs/heads/master@{#19436}
> Committed: https://chromium.googlesource.com/external/webrtc/+/1fd66656b3754c22a43f4eded57e022916bb6064

TBR=magjed@webrtc.org,emircan@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:735959

Review-Url: https://codereview.webrtc.org/2995373002
Cr-Commit-Position: refs/heads/master@{#19438}
diff --git a/webrtc/media/engine/videoencodersoftwarefallbackwrapper.h b/webrtc/media/engine/videoencodersoftwarefallbackwrapper.h
index 8061c00..d11a0f6 100644
--- a/webrtc/media/engine/videoencodersoftwarefallbackwrapper.h
+++ b/webrtc/media/engine/videoencodersoftwarefallbackwrapper.h
@@ -77,7 +77,6 @@
   bool TryReInitForcedFallbackEncoder();
   void ValidateSettingsForForcedFallback();
   bool IsForcedFallbackActive() const;
-  void MaybeModifyCodecForFallback();
 
   // Settings used in the last InitEncode call and used if a dynamic fallback to
   // software is required.
@@ -95,7 +94,7 @@
   uint32_t packet_loss_;
   int64_t rtt_;
 
-  cricket::VideoCodec codec_;
+  const cricket::VideoCodec codec_;
   webrtc::VideoEncoder* const encoder_;
 
   std::unique_ptr<webrtc::VideoEncoder> fallback_encoder_;