Remove some studies from the config file.

This is because Windows has a command line size limit and too many
testing configs can result in the limit being hit.

See comment 3 on the bug for details on why these studies are candidates
for removal.

Bug: 1126640

Change-Id: Id33a88a789bb1322519f11b3e861c3cbe93280db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401703Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#805568}

testing/variations/fieldtrial_testing_config.json

@@ -2288,21 +2288,6 @@
             ]
         }
     ],
-    "EnableMediaRouter": [
-        {
-            "platforms": [
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled"
-                }
-            ]
-        }
-    ],
     "EnableNewBadgeOnMenuItems": [
         {
             "platforms": [
@@ -2398,27 +2383,6 @@
             ]
         }
     ],
-    "ExpectCTReporting": [
-        {
-            "platforms": [
-                "android",
-                "android_weblayer",
-                "chromeos",
-                "ios",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "ExpectCTReportingEnabled",
-                    "enable_features": [
-                        "ExpectCTReporting"
-                    ]
-                }
-            ]
-        }
-    ],
     "ExploreSitesDense": [
         {
             "platforms": [
@@ -2439,18 +2403,6 @@
             ]
         }
     ],
-    "ExtensionContentVerification": [
-        {
-            "platforms": [
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "EnforceStrict"
-                }
-            ]
-        }
-    ],
     "ExtensionInstallVerification": [
         {
             "platforms": [
@@ -2481,24 +2433,6 @@
             ]
         }
     ],
-    "ExtensionsToolbarMenu": [
-        {
-            "platforms": [
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "ExtensionsToolbarMenu"
-                    ]
-                }
-            ]
-        }
-    ],
     "FeedActionsUpload": [
         {
             "platforms": [
@@ -2521,26 +2455,6 @@
             ]
         }
     ],
-    "FilterAdsOnAbusiveSites": [
-        {
-            "platforms": [
-                "android",
-                "android_weblayer",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "FilterAdsOnAbusiveSites"
-                    ]
-                }
-            ]
-        }
-    ],
     "FindInPageBestEffortPriority": [
         {
             "platforms": [
@@ -2602,27 +2516,6 @@
             ]
         }
     ],
-    "FontSrcLocalMatching": [
-        {
-            "platforms": [
-                "android",
-                "android_weblayer",
-                "android_webview",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "FontSrcLocalMatching"
-                    ]
-                }
-            ]
-        }
-    ],
     "FormControlsDarkMode": [
         {
             "platforms": [
@@ -2862,23 +2755,6 @@
             ]
         }
     ],
-    "GpuUseDisplayThreadPriority": [
-        {
-            "platforms": [
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "BlinkCompositorUseDisplayThreadPriority",
-                        "GpuProcessHighPriorityWin",
-                        "GpuUseDisplayThreadPriority"
-                    ]
-                }
-            ]
-        }
-    ],
     "GpuWatchdogV2NewTimeout": [
         {
             "platforms": [