Obsolete and remove counts DensitySizeCorrectionDetected histogram

Blink.DecodedImage.DensitySizeCorrectionDetected was necessary to
test backwards compatibility of a new feature, this test is finished.

Removed all calls for the count, test, and obsoleted histogram.

Bug: 1152025
Change-Id: I16870a075271ead8ba46a44c6c0f4a485acc4551
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567927Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Stephen Chenney <schenney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833283}

third_party/blink/renderer/platform/graphics/bitmap_image.cc

@@ -346,14 +346,8 @@ bool BitmapImage::IsSizeAvailable() {
     return true;
 
   size_available_ = decoder_ && decoder_->IsSizeAvailable();
-  if (size_available_ && HasVisibleImageSize(Size())) {
+  if (size_available_ && HasVisibleImageSize(Size()))
     BitmapImageMetrics::CountDecodedImageType(decoder_->FilenameExtension());
-    if (decoder_->FilenameExtension() == "jpg") {
-      IntSize correctedSize = decoder_->DensityCorrectedSizeAtIndex(0);
-      BitmapImageMetrics::CountImageDensityCorrection(
-        !correctedSize.IsEmpty() && correctedSize != decoder_->Size());
-    }
-  }
 
   return size_available_;
 }

third_party/blink/renderer/platform/graphics/bitmap_image_metrics.cc

@@ -39,11 +39,6 @@ void BitmapImageMetrics::CountDecodedImageType(const String& type) {
   UMA_HISTOGRAM_ENUMERATION("Blink.DecodedImageType", decoded_image_type);
 }
 
-void BitmapImageMetrics::CountImageDensityCorrection(bool density_correction_present) {
-  UMA_HISTOGRAM_BOOLEAN("Blink.DecodedImage.DensitySizeCorrectionDetected",
-                        density_correction_present);
-}
-
 void BitmapImageMetrics::CountImageJpegDensity(int image_min_side,
                                                uint64_t density_centi_bpp,
                                                size_t image_size_bytes) {

third_party/blink/renderer/platform/graphics/bitmap_image_metrics.h

@@ -55,7 +55,6 @@ class PLATFORM_EXPORT BitmapImageMetrics {
 
   // |type| is the return value of ImageDecoder::FilenameExtension().
   static void CountDecodedImageType(const String& type);
-  static void CountImageDensityCorrection(bool densityCorrectionPresent);
   // Report the JPEG compression density in 0.01 bits per pixel for an image
   // with a smallest side (width or length) of |image_min_side| and total size
   // in bytes |image_size_bytes|.

third_party/blink/renderer/platform/graphics/bitmap_image_test.cc

@@ -828,33 +828,6 @@ TEST_F(BitmapHistogramTest, DecodedImageType) {
 #endif  // BUILDFLAG(ENABLE_AV1_DECODER)
 }
 
-TEST_F(BitmapHistogramTest, DecodedImageDensitySizeCorrectionDetected) {
-  ExpectImageRecordsSample("exif-resolution-none.jpg",
-                           "Blink.DecodedImage.DensitySizeCorrectionDetected",
-                           false);
-  ExpectImageRecordsSample("exif-resolution-invalid-cm.jpg",
-                           "Blink.DecodedImage.DensitySizeCorrectionDetected",
-                           false);
-  ExpectImageRecordsSample("exif-resolution-invalid-no-match.jpg",
-                           "Blink.DecodedImage.DensitySizeCorrectionDetected",
-                           false);
-  ExpectImageRecordsSample("exif-resolution-invalid-partial.jpg",
-                           "Blink.DecodedImage.DensitySizeCorrectionDetected",
-                           false);
-  ExpectImageRecordsSample("exif-resolution-no-change.jpg",
-                           "Blink.DecodedImage.DensitySizeCorrectionDetected",
-                           false);
-  ExpectImageRecordsSample("exif-resolution-valid-hires.jpg",
-                           "Blink.DecodedImage.DensitySizeCorrectionDetected",
-                           true);
-  ExpectImageRecordsSample("exif-resolution-valid-lores.jpg",
-                           "Blink.DecodedImage.DensitySizeCorrectionDetected",
-                           true);
-  ExpectImageRecordsSample("exif-resolution-valid-non-uniform.jpg",
-                           "Blink.DecodedImage.DensitySizeCorrectionDetected",
-                           true);
-}
-
 TEST_F(BitmapHistogramTest, DecodedImageDensityKiBWeighted_JpegDensity) {
   // Test a 64x64 image, which should be too small to report any metrics.
   {

tools/metrics/histograms/histograms_xml/blink/histograms.xml

@@ -540,6 +540,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram name="Blink.DecodedImage.DensitySizeCorrectionDetected"
     enum="BooleanPresent" expires_after="2021-01-03">
+  <obsolete>
+    Removed in M89.
+  </obsolete>
   <owner>schenney@chromium.org</owner>
   <owner>noam.j.rosenthal@gmail.com</owner>
   <owner>paint-dev@chromium.org</owner>