Revert of Implement webview.captureVisibleRegion() (patchset #9 id:160001 of https://codereview.chromium.org/1582053002/ )

Reason for revert:
The test WebViewAPITest.TestCaptureVisibleRegion is failing on several windows bots:

https://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29/builds/45040
https://build.chromium.org/p/chromium.win/builders/XP%20Tests%20%281%29/builds/42690
https://build.chromium.org/p/chromium.win/builders/Vista%20Tests%20%281%29/builds/64394

Original issue's description:
> Implement webview.captureVisibleRegion()
>
> This CL implements  webview.captureVisibleRegion(), an extension/apps
> API to allow WebView users to capture screenshots of the contents
> displayed in a WebView. The surfaces contents capture has been plumbed
> via RenderWidgetHostViewChildFrame so this implementation should not
> require changes when WebView switches to using OOPIF.
>
> As part of the implementation, there are two notable refactors:
>
> 1) CaptureWebContentsFunction has been refactored into
> WebContentsCaptureClient to remove the extensions::AsyncExtensionFunction
> dependence so that this code can be used by both tabs.captureVisibleTab
> and webview.captureVisibleRegion, and
>
> 2) common code from DelegatedFrameHost has ben moved to
> content/browser/compositor/surface_utils.* in order to avoid duplication
> as both DelegatedFrameHost and RenderWidgetHostViewChildFrame now
> use the code.
>
> BUG=326755
>
> Committed: https://crrev.com/5b8cdcc82fc9da7bab15fd3dbf65df843dc73589
> Cr-Commit-Position: refs/heads/master@{#370565}

TBR=rockot@chromium.org,creis@chromium.org,kenrb@chromium.org,nick@chromium.org,fsamuel@chromium.org,wjmaclean@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=326755

Review URL: https://codereview.chromium.org/1614703003

Cr-Commit-Position: refs/heads/master@{#370641}

2 files changed, 0 insertions, 33 deletions

diff --git a/extensions/common/api/_api_features.json b/extensions/common/api/_api_features.json
index 5e07269..b30775f 100644
--- a/extensions/common/api/_api_features.json
+++ b/extensions/common/api/_api_features.json
@@ -460,12 +460,6 @@
       "chrome://oobe/*"
     ]
   }],
-  "webViewExperimentalInternal": [{
-    "internal": true,
-    "channel": "dev",
-    "dependencies": ["permission:webview"],
-    "contexts": ["blessed_extension"]
-  }],
   "webViewRequest": [{
     "dependencies": ["permission:webview"],
     "contexts": ["blessed_extension"]
diff --git a/extensions/common/api/web_view_internal.json b/extensions/common/api/web_view_internal.json
index 94a6eb9..a33f500 100644
--- a/extensions/common/api/web_view_internal.json
+++ b/extensions/common/api/web_view_internal.json
@@ -670,33 +670,6 @@
         ]
       },
       {
-        "name": "captureVisibleRegion",
-        "type": "function",
-        "description": "foo",
-        "parameters": [
-          {
-            "type": "integer",
-            "name": "instanceId",
-            "description": "The instance ID of the guest <webview> process."
-          },
-          {
-            "$ref": "extensionTypes.ImageDetails",
-            "name": "options",
-            "optional": true
-          },
-          {
-            "type": "function",
-            "name": "callback",
-            "parameters": [
-              {"type": "string",
-                "name": "dataUrl",
-                "description": "A data URL which encodes an image of the visible area of the captured tab. May be assigned to the 'src' property of an HTML Image element for display."
-              }
-            ]
-          }
-        ]
-      },
-      {
         "name": "clearData",
         "type": "function",
         "description": "Clears various types of browsing data stored in a storage partition of a <webview>.",