[testing] switch to use xenial for swarming test

This CL switches to use xenial for test as many as possible.

Sheriff:
If this broke some ci/fyi builder, feel free to revert this.

TBR=jbudorick

Bug: 954450
Change-Id: I98abfb50bb10ca3eeec0e23d197fe7672c8acc95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1689513Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675527}

testing/buildbot/chromium.goma.json

@@ -21,7 +21,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -36,7 +36,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -58,7 +58,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -73,7 +73,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -95,7 +95,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -110,7 +110,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -132,7 +132,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -147,7 +147,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -169,7 +169,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -184,7 +184,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },

testing/buildbot/chromium.webrtc.fyi.json

@@ -146,7 +146,7 @@
           "dimension_sets": [
             {
               "cpu": "x86-64",
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -167,7 +167,7 @@
           "dimension_sets": [
             {
               "cpu": "x86-64",
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -186,7 +186,7 @@
           "dimension_sets": [
             {
               "cpu": "x86-64",
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -208,7 +208,7 @@
           "dimension_sets": [
             {
               "cpu": "x86-64",
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -227,7 +227,7 @@
           "dimension_sets": [
             {
               "cpu": "x86-64",
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -243,7 +243,7 @@
           "dimension_sets": [
             {
               "cpu": "x86-64",
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -262,7 +262,7 @@
           "dimension_sets": [
             {
               "cpu": "x86-64",
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },

testing/buildbot/chromium.webrtc.json

@@ -107,7 +107,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -127,7 +127,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -161,7 +161,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -182,7 +182,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -203,7 +203,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -221,7 +221,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -236,7 +236,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },
@@ -254,7 +254,7 @@
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
-              "os": "Ubuntu-14.04"
+              "os": "Ubuntu-16.04"
             }
           ]
         },