Revert of Enable video processing unittest to take video clips as param. (patchset #1 id:1 of https://codereview.webrtc.org/1907353004/ )

Reason for revert:
Candidate culprit CL for breaking the gtest initialization on DrMemory.

Original issue's description:
> Enable video processing unittest to take video clips as param.
>
> This change enables video processing unittest (including all tests under
> it, e.g. denoiser test) to use a set of video clips as param, which is
> important if we want to do a regression test on the visual quality
> offline.
>
> BUG=
>
> Committed: https://crrev.com/6d94e5224a3d3b1a6d66a428dbe75af7106e8d60
> Cr-Commit-Position: refs/heads/master@{#12485}

TBR=marpan@webrtc.org,jackychen@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.webrtc.org/1915973002

Cr-Commit-Position: refs/heads/master@{#12490}

webrtc/modules/video_processing/test/content_metrics_test.cc

@@ -18,9 +18,9 @@
 namespace webrtc {
 
 #if defined(WEBRTC_IOS)
-TEST_P(VideoProcessingTest, DISABLED_ContentAnalysis) {
+TEST_F(VideoProcessingTest, DISABLED_ContentAnalysis) {
 #else
-TEST_P(VideoProcessingTest, ContentAnalysis) {
+TEST_F(VideoProcessingTest, ContentAnalysis) {
 #endif
   VPMContentAnalysis ca__c(false);
   VPMContentAnalysis ca__sse(true);