Drop Precise blink builders on chromium.webkit, add corresponding Trusty builders.

scripts/slave/recipe_modules/chromium_tests/chromium_webkit.py

Index: scripts/slave/recipe_modules/chromium_tests/chromium_webkit.py
diff --git a/scripts/slave/recipe_modules/chromium_tests/chromium_webkit.py b/scripts/slave/recipe_modules/chromium_tests/chromium_webkit.py
index 59beb5a39941d7c3b645f9ff332e14fc6b2c4fb7..0d67ef73bf352033fe26e5994c1c1306f4936f54 100644
--- a/scripts/slave/recipe_modules/chromium_tests/chromium_webkit.py
+++ b/scripts/slave/recipe_modules/chromium_tests/chromium_webkit.py
@@ -298,27 +298,6 @@ SPEC['builders'] = {
     'use_isolate': True,
     'checkout_dir': 'mac_layout',
   },
-  'WebKit Linux Precise': {
-    'chromium_config': 'chromium',
-    'chromium_apply_config': ['mb', 'ninja_confirm_noop'],
-    'gclient_config': 'chromium',
-    'chromium_config_kwargs': {
-      'BUILD_CONFIG': 'Release',
-      'TARGET_BITS': 64,
-    },
-    'compile_targets': [
-      'blink_tests',
-    ],
-    'tests': [
-      steps.BlinkTest(),
-    ],
-    'testing': {
-      'platform': 'linux',
-    },
-    'enable_swarming': True,
-    'use_isolate': True,
-    'checkout_dir': 'linux_layout',
-  },
   'WebKit Linux Trusty': {
     'chromium_config': 'chromium',
     'chromium_apply_config': ['mb'],
@@ -340,7 +319,7 @@ SPEC['builders'] = {
     'use_isolate': True,
     'checkout_dir': 'linux_layout',
   },
-  'WebKit Linux Precise ASAN': {
+  'WebKit Linux Trusty ASAN': {
     'chromium_config': 'chromium_clang',
     'chromium_apply_config': ['asan', 'mb'],
     'gclient_config': 'chromium',
@@ -364,7 +343,7 @@ SPEC['builders'] = {
     'use_isolate': True,
     'checkout_dir': 'linux_layout',
   },
-  'WebKit Linux Precise MSAN': {
+  'WebKit Linux Trusty MSAN': {
     'chromium_config': 'chromium_clang',
     'gclient_config': 'chromium',
     'chromium_apply_config': [
@@ -394,7 +373,7 @@ SPEC['builders'] = {
     'use_isolate': True,
     'checkout_dir': 'linux_layout',
   },
-  'WebKit Linux Precise (dbg)': {
+  'WebKit Linux Trusty (dbg)': {
     'chromium_config': 'chromium',
     'chromium_apply_config': ['mb'],
     'gclient_config': 'chromium',
@@ -451,7 +430,7 @@ SPEC['builders'] = {
       'platform': 'linux',
     },
   },
-  'WebKit Linux Precise Leak': {
+  'WebKit Linux Trusty Leak': {
     'chromium_config': 'chromium',
     'chromium_apply_config': ['mb'],
     'gclient_config': 'chromium',